When will we know results of presidential race?

    Just Watched

    CNN Explains: Electoral College

CNN Explains: Electoral College 02:57

Story highlights

  • Reporting of results paused in Virginia
  • Presidential results could be delayed if battleground Ohio is particularly close
  • Polls begin closing at 7 p.m. ET
  • Virginia could be an early indicator, CNN's John King says

It's been a grueling campaign. You just want to sit down with a bowl of popcorn and find out who will be president for the next four years.

So when will we know?

Technically speaking -- who the heck can say?

With a race that went into Election Day neck and neck, and plenty of questions about how key battleground states will play out, it's reasonable to assume a long night is in store.

What to watch for

It could be even longer if the election ends up balanced on the edge of a razor-thin vote in Ohio or if voting irregularities spark legal challenges in any of a number of critical states.

Either situation could drag out the decision until mid-November or even longer, analysts say.

      Just Watched

      CNN election night flashback

    CNN election night flashback 02:35

      Just Watched

      Crowley on Election Day in America

    Crowley on Election Day in America 06:17

      Just Watched

      Strickland: Ohio goes Obama at 11:37 pm

    Strickland: Ohio goes Obama at 11:37 pm 02:03

    Whatever happens, some indications should begin to trickle in now that the first waves of poll closings have come, ending voting in Virginia, Florida, Ohio and other key states.

    West Coast states and Hawaii will stop voting at 11 p.m. ET, and the last Americans will cast their ballots in Alaska by 1 a.m. ET Wednesday.

    The first place to look: Virginia, according to analysts. But the reporting of results was paused after 7 p.m. because many voters remained in line after the scheduled poll closing time, the state Board of Elections said.

    When results do come in, Prince William County will be a key indicator, CNN chief national correspondent John King said.

    "One of the first things I'll look at are the margins in the northern Virginia suburbs closest to Washington, D.C., especially Prince William County," he said.

    Drama awaits in battleground states

    "If Gov. Romney is ahead or at least in play there, it means Virginia is in play, and we could have a long, competitive night," King said. "If he's not in play, it could be over before we even get to the Central time zone."

    CNN's chief politcal analyst, Gloria Borger, agreed that Virginia will have a lot to say about what happens later.

    "We have to look at Loudoun County in Virginia, and if the president were to win Virginia, obviously, the path to 270 is a lot easier for him," she said. "But if Mitt Romney wins Virginia, it could be a much longer night."

    CNN political reporter Peter Hamby said that results from early and absentee balloting in Pasco County, Florida, could also offer a tantalizing glimpse of what the night may hold.

    Barack Obama won the early and absentee vote in the slightly Republican-leaning county in 2008. If Obama comes up trailing when those early votes are posted soon after polls close, it could indicate the president might have trouble carrying Florida and its crucial electoral votes, according to Hamby.

      Just Watched

      Campaign lawyers ready for legal fight

    Campaign lawyers ready for legal fight 02:21

      Just Watched

      Election results ... we have to wait

    Election results ... we have to wait 00:23

      Just Watched

      Rubio: Ohio a critical state for Romney

    Rubio: Ohio a critical state for Romney 04:41

    Frum: U.S. voting system is a disgrace

    If Ohio becomes key to the election, it's possible that bag of popcorn isn't going to hold you.

    If the margin separating Romney and Obama is particularly thin, the election in that key battleground state could ride on absentee and provisional ballots. And that could keep the nation in suspense for a whopping 10 days.

    Ohio provisional ballots hold key

    That's how long Ohio law gives poll workers to check the eligibility of provisional voters.

    Ohio has one of the nation's highest rates of provisional voting, with 211,000 cast in 2008, according to Ohio Secretary of State Jon Husted. About 40,000 were later thrown out.

    Husted says he thinks the election in Ohio will hinge on the state's central counties, and the results will be known before midnight.

    "I really believe that we will be able to project a winner tonight," he said. "I think that people will have to stay up past their bedtime to be able to do that. But it's likely that we'll know by the end of the evening."

    Popular-electoral split is possible

    The worst nightmare scenario is a redux of 2000, when the nation suffered through weeks of uncertainty amid recounts and legal challenges surrounding the vote in Florida.

    And, sorry to say it, as tightly contested as this race is, it is a possibility, analysts say.

    "Between provisional balloting, absentee balloting and voting technology, I think there are untold different ways that this is a tense, contested election," said Rebecca Green, co-director of the Election Law Program at William & Mary Law School. "It's pretty certain there's going to be some litigation when this is over on November 6."

    As we said -- who knows?

    Election 2012: Projections

        Election 2012

      • CHICAGO, IL - NOVEMBER 06:  U.S. President Barack Obama stands on stage with first lady Michelle Obama, U.S. Vice President Joe Biden and Dr. Jill Biden after his victory speech on election night at McCormick Place November 6, 2012 in Chicago, Illinois. Obama won reelection against Republican candidate, former Massachusetts Governor Mitt Romney.  (Photo by Chip Somodevilla/Getty Images)

        A black man is returning to the White House. Four years ago, it was a first, the breaking of a racial barrier. Tuesday night, it was history redux. And more.
      • CHICAGO, IL - NOVEMBER 06:  U.S. President Barack Obama stands on stage after his victory speech at McCormick Place November 6, 2012 in Chicago, Illinois. Obama won reelection against Republican candidate, former Massachusetts Governor Mitt Romney.  (Photo by Chip Somodevilla/Getty Images)

        The 2012 presidential election shattered spending records, further polarized a divided country and launched a thousand hashtags.
      • Even though voters indicated to pollsters that their financial situation is the same or worse than it was four years ago, they put their trust in the president.
      • US President Barack Obama addresses a crowd of supporters on stage on election night November 6, 2012 in Chicago, Illinois. President Barack Obama swept to re-election Tuesday, forging history again by transcending a slow economic recovery and the high unemployment which haunted his first term to beat Republican Mitt Romney. AFP PHOTO/Jewel Samad        (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

        The president faces a long and familiar set of challenges after riding a wave of support from moderates, women and minorities to victory.
      • Republicans kept a lock on the U.S. House of Representatives, a crucial victory after the party failed to wrest away the presidency from Barack Obama and the Senate from the Democrats.