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As of early Tuesday morning, the Iowa Democratic caucus race between Hillary Clinton and Bernie Sanders was still too close to call.

Hillary Clinton told a packed room she was "breathing a big sigh of relief," but did not declare victory.

With 1621 of 1683, or 96%, precincts reporting after midnight on Tuesday, Clinton had 49.9% of the delegates to Sanders' 49.6%.

Click here for the results from the GOP race.

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12:01am ET: Hillary Clinton told supporters she knew that the country could "finish the job of universal health care coverage" and "combat climate change and become the clean energy superpower of the 21st century."

“I am excited about really getting into the debate with Senator Sanders about the best way forward to fight for us and America.”

11:58pm ET: Bernie Sanders said the people of Iowa sent a profound message to the political, economic and media establishment.

"It is just too late for establishment politics and establishment economics," Sanders said.

"What the American people have said...we can no longer continue to have a corrupt campaign finance system."

Sanders said he was overwhelmed by the fact that millions of people throughout the country volunteered and contributed to his campaign.

He said the average contribution to his campaign was $27.

11:49pm ET: Fox News' decision desk has classified the Iowa Democratic caucuses "too close to call."

Hillary Clinton told a packed room she was "breathing a big sigh of relief," but did not declare victory.

11:34pm ET: 

11:15pm ET: Ed Henry reported that the Clinton campaign believes it has won even though data showed she was only leading by 0.4%

"Bottom line is, this is a nail-biter. This is a lot worse than the Clinton camp ever expected."

James Rosen reported from the Sanders HQ that the Sanders campaign is regarding this as a victory "no matter what the final tally is."

"Not least because the two candidate will emerge from Iowa with roughly the same number of delegates, but because Bernie Sanders at so many points...has been written off for dead."

10:54pm ET: Bret Baier reported that Clinton's lead over Sanders has shrunk to 0.2%. With 90% of the precincts in, Clinton holds 49.8% of the vote, while Sanders holds 49.6%.

The scoreboard showed both candidates with 50%.

"This is a barn burner, folks," he said.

10:32pm ET: With 84% of results in, Clinton still holds a roughly 1% lead over Sanders.

10:05pm ET: Ed Henry reports that former Maryland Governor Martin O'Malley is suspending his campaign. An O'Malley official said he will make the announcement at about 10:30pm ET.

A Democratic official says that Clinton is confident of victory but is nervous that she is only winning by about 1.5 percentage points right now -- and precincts that take longer to report are likely ones with the most new voters.

This means that Sanders numbers may increase as the night goes on.

10:03pm ET: With 73% precincts reporting, Sanders closes the gap with Clinton to >1%.

9:45pm ET: With 58% of precincts reporting, Megyn Kelly said Clinton's lead over Sanders is "razor thin."

9:25pm ET: Peter Doocy reported that the Ames site sent 5 delegates to Sanders and 3 to Clinton.

9:12pm ET: Peter Doocy reported from a Democratic caucus site in Ames, Iowa.

"Right now, some folks from the Clinton side and from the Sanders side are playing a game of 'Let's Make a Deal' to try to get the O'Malley backers to go and sit--or at this location, stand--with them. They keep doing counts. It is quite a night, quite a sight here in Ames."

8:46pm ET: With 11% of precincts reporting so far, Bret Baier reported that the Democratic race is very close.

8:38pm ET: Martha MacCallum shared some more entrance poll data that showed "Sanders is killing it with the young folks."

91% percent of those under age 30 are backing Sanders, compared to 8% for Clinton.

But there are twice as many seniors as young people at the caucuses, and they are backing Clinton 69% to 23%, despite the fact that Sanders is 73 years old.

8:05pm ET: Martha MacCallum presented some early entrance poll data from 40 sites across the state.

The polls found that 59% of first-time caucus-goers plan to choose Sanders, compared to 38% for Clinton.

People who say that electability is the single most important factor for them are going for Clinton, 71% to 18%.

But Democrats who say they want a nominee who is honest and trustworthy are backing Sanders by a wide margin, 77% to 14%.

Megyn Kelly also reported that Fox News can now safely project that former Maryland Governor Martin O'Malley will finish third in the Democratic contest.

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