(CNN) -- Sens. Barack Obama and Hillary Clinton are courting one-time rival John Edwards as they move forward in the delegate-by-delegate fight for their party's nomination.
Sen. Barack Obama met with John Edwards in North Carolina on Sunday.
Obama met with the former North Carolina senator on Sunday, and Clinton met with him after the February 5 Super Tuesday contests.
Edwards, who picked up 26 delegates before abandoning his White House bid last month, is reportedly torn over which candidate to endorse.
Edwards ran a populist campaign, railing against corporate interests he said have "rigged" Washington against ordinary Americans.
His best showing was a second-place finish in the Iowa caucuses, which Obama won, and he placed third in the next four contests.
In addition to trying to gain the support of Edwards, Obama and Clinton also are fighting for votes in Tuesday's contests in Wisconsin, Washington state and Hawaii.
With the race so close, even states with few delegates up for grabs have become high-stakes territory.
Recent polls suggest that the Democratic race in Wisconsin is a tossup. In an American Research Group poll taken February 15-16, Clinton leads Obama 49-43 percent. The poll questioned 600 likely Democratic primary voters and has a margin of error of plus or minus 4 percentage points.
A poll from Research 2000 taken February 13-14, however, shows Obama ahead of Clinton, 47-42 percent. That poll questioned 400 likely Democratic primary voters and has a sampling error of plus or minus 5 percentage points.
Obama on Monday is expected to attend rallies at Youngstown State University in Youngstown, Ohio, and at Beloit College in Beloit, Wisconsin. Watch what's at stake in Wisconsin »
Clinton will be attending a town hall meeting at St. Norbert University, in De Pere, Wisconsin, and a rally in Madison, Wisconsin, before heading to Ohio.
In Hawaii, Chelsea Clinton is campaigning for her mother while Obama's younger sister, Maya Soetoro-Ng, is handling the state for him.
Obama was born in Honolulu and spent much of his childhood there.
Bad weather derailed some campaign stops in Wisconsin this weekend, so Obama took to local airwaves to spread his message.
"We want every single voter out there to come out. And by the way, not just Democrats -- but also independents and maybe some disenchanted Republicans -- we want your votes as well," he told WBAY-TV in Wisconsin.
Clinton faced similar weather-related problems but did surprise shoppers by making an impromptu stop at a grocery story in Milwaukee, Wisconsin. Watch Clinton mingle with shoppers »
Both candidates gave speeches Saturday at the Democratic Party of Wisconsin's Founders Day Gala.
Clinton delivered a relatively mild speech with largely indirect attacks aimed at Obama, while his remarks minutes later were more targeted.
Obama accused Clinton, as he has in the past, of participating in the "politics of the moment" by taking certain positions simply because it's campaign season.
"I didn't just start criticizing unfair trade deals like NAFTA and China because I started running for president," Obama said, referring to the North American Free Trade Agreement, a treaty signed into law by former President Bill Clinton. Obama often points out that Hillary Clinton praised NAFTA during her husband's administration.
Obama served up a backhanded compliment, saying he "applauds" Clinton's health care plan, which he said includes some of the same steps he proposed "last spring." Clinton introduced her health care plan in September.
The final portion of Obama's speech was largely ad-libbed with slightly tweaked material from his stump over the last week. It included lines directed at Clinton's recent heightened criticism that Obama is a "talker and not a doer" and that this election is not about "speeches" but "solutions" -- a theme Clinton also pushed in her comments at the dinner.
"It's true that speeches don't solve all problems, but what is also true is if we cannot inspire the country to believe again then it doesn't matter how many policies and plans we have," Obama said.
The Illinois senator is coming off an eight-state winning streak.
Clinton, who has largely been looking ahead to the March 4 contests in Ohio, Texas, Rhode Island and Vermont, criticized her rival for not debating her in Wisconsin.
"I think the fact that he won't debate me says a lot about his campaign," Clinton told reporters.
Obama's camp said they have debated enough.
As of Monday, Obama leads Clinton with 1,262 total delegates. The New York senator has 1,213.
Clinton has the support of more superdelegates, a group of almost 800 Democratic party officials and leaders who also will cast votes at the nominating convention this summer.
Because superdelegates are not required to make their presidential preferences public and are free to change their minds, it is difficult to pinpoint the exact number of superdelegate supporters either candidate has at any given time.
Neither candidate is expected to have enough pledged delegates to win the nomination before the party's convention in August. E-mail to a friend
CNN's Mary Snow, Suzanne Malveaux and Chris Welch contributed to this report.
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