There are at least 22 Democrats thinking about running for president in 2020

(CNN)There are 1,281 days between today and the Nov. 3, 2020 presidential election. But, with Donald Trump in the White House, Democratic politicians are already eagerly jockeying for position with the expectation that the party's nominee will have a very good chance of ousting the incumbent -- if his poll numbers stay anywhere as low as they are at the moment.

One potential candidate who looks like she's decided against running is New York Sen. Kirsten Gillibrand. "I'm focused entirely on running for Senate, so yes, I'm ruling it out," she said Monday in New York.
Gillibrand's announcement is a bit of a surprise given that she was widely seen as a likely candidate. (She, of course, could change her mind sometime between now and 2020. See "Obama, Barack" on that front.)
Gillibrand's news got me to thinking: Just how many people are thinking about/mentioned/floating themselves for the Democratic nomination and where, roughly, do they fit when it comes to their chances of winning?
Below I broke the field into four tiers as a way to think about the massive number of potential competitors. These names -- and the groups they fall into -- are based on email exchanges with more than a dozen national Democratic strategists, many of whom are veterans of the Obama and Clinton campaigns.
One grain of salt before we proceed. A prominent Democratic consultant offered this analysis of the current field: "I don't think there is a top tier. I think our bench is that weak so everyone starts in Tier B."
Also, I've placed them in alphabetical order within their respective tiers.

1st Tier (If they run, they have a real chance to win the nomination)

Joe Biden

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The former vice president clearly regrets not running in 2016. And he's keeping the sort of schedule -- New Hampshire speech! -- that makes him look like someone who's thinking of running.

Bernie Sanders

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The Vermont independent started a movement in 2016. His grassroots activist and donor base is bigger than anyone in the potential 2020 field.

Elizabeth Warren

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Warren, prior to 2016, was the face of the populist, anti-Wall Street wing of the Democratic party. Sanders cut into Warren's dominance in his presidential campaign. But, she remains the single most beloved figure among liberals.

2nd Tier (Have potential to be a major contender but not there....yet)

Cory Booker

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A few people I talked to suggested the New Jersey Senator belonged in the top tier. I am skeptical not just because of the mediocre Senate campaign he ran in 2013 but also because of his well-documented ties to Wall Street.

Andrew Cuomo

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A two-term governor of New York with a record of liberal accomplishments and a famous last name? Check, check and check.

Al Franken

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The Minnesota Senator emerged as one of the leading critics of Trump's Cabinet picks in the early days of the administration. And he's gone from a sideshow to a serious legislator in his eight years in the Senate.

Kamala Harris

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The newly-minted California senator is avoiding any talk about her future ambitions. But her history-making Senate bid -- she's the first Indian American and first black senator from California -- and the state's size and massive Democratic dominance makes her appealing

Jay Inslee

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That so few people in Washington buzz about the two term Washington governor is a pretty obvious case of East Coast bias. Inslee has spent time in Washington (D.C.) as a member of Congress and got a major media boost from his state's role in blocking Trump's travel ban.

Tim Kaine

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The 2016 vice presidential nominee has insisted he won't run for the top job in 2020. I take him (mostly) at his word, so he sits in the 2nd tier. But if Kaine runs -- particularly with the blessing -- and endorsement(?) -- of Hillary Clinton he could be formidable.

Terry McAuliffe

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The Virginia governor is term-limited out of a job later this year and there is already chatter about what he might do next. And, his prominent role leading Democratic redistricting efforts gives him a national platform and fundraising base. Also, the Clintons.

Chris Murphy

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The Connecticut Senator's profile has soared since the tragedy in Newtown in December 2012. Murphy has not just emerged as a lead voice on gun control but also as a point man in attacks on Trump. Some whisper he is too green and ambitious. But that's rarely a hindrance in presidential politics.

3rd Tier (There's a chance but....)

Steve Bullock

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The governor of Montana is a Democrat. Did you know that? Probably not. That's Bullock's problem. But, if Democrats are looking for new voice from the Mountain West, he has a puncher's shot.

Eric Garcetti

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The popular mayor of Los Angeles is mulling runs for governor in 2018 and president in 2020. President seems like too big a leap. Particularly with fellow Californian Kamala Harris lurking.

John Hickenlooper

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Quietly, the governor of Colorado made it to the final cut of Clinton's vice presidential list. He has a powerful story -- small businessman, mayor of Denver, two term governor -- and represents a part of the county where Democrats are growing. But, he is very low-key -- and may be too moderate for Democratic primary voters.

Amy Klobuchar

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Klobuchar, who has represented Minnesota since 2006, and is widely seen as both ambitious and talented. But, buzz about Franken is eclipsing her right now.

Mitch Landrieu

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The mayor of New Orleans -- and scion to a famous political family -- was floated as a possible presidential candidate in the New York Times. Which is something. But hard to see how he gets from here to there.

Seth Moulton

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The Massachusetts House member wins rave reviews and is seen by almost everyone as a future Democratic leader. (I had an email exchange with Moulton about the future of the Democratic party back in February.) But 2020 feels, at least at the moment, like too much of a leap.

Martin O'Malley

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O'Malley ran a respectable campaign for president in 2016 and judging by his travel might want to run it back. But it's hard to see how a 2020 bid would be much different than his 2016 run.

No Tier (Rich businesspeople who've never run for anything before)

Mark Cuban

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The Dallas Mavericks owner has emerged as one of the most vocal -- and effective -- critics of Trump. If he ran, he'd likely bill himself as a Trump 2.0 -- a successful businessman bringing the lessons he's learned in the private sector to public office.

Sheryl Sandberg

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Facebook's chief operating officer is much more than a tech executive these days. Her acclaimed "Lean In" started a national conversation about women (and men) in the workforce. And, her recent memoir about the sudden death of her husband has also been well received. FWIW: She denies any interest in the race.

Howard Schultz

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The Starbucks founder is clearly interested in influencing public policy going forward -- although it remains to be seen if that means a presidential bid. Schultz has a rags-to-riches story that most people don't know and would almost certainly be appealing.

Mark Zuckerberg

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No, there won't be two Facebook executives running for president in 2020. (There probably won't be any.) But, Zuckerberg, who founded Facebook, has been on a tour of the Rust Belt of late that has sparked talk of political ambition. if he did run -- he almost certainly won't -- his ubiquity and massive personal fortune would make him an intriguing candidate.