Bernie Sanders, Hillary Clinton Neck-and-Neck in New Hampshire and Iowa, Polls Find

New polls show Hillary Clinton and Bernie Sanders in statistical tie

The polls, which both had a margin of error of +/- 4.8 percent, showed that Clinton had 48 percent among likely Iowa caucus-goers, compared to Sanders’ 45 percent and former Maryland Gov. Martin O'Malley's 5 percent. In New Hampshire, however, the poll found Sanders had 50 percent among likely primary voters, compared to Clinton's 46 percent and O’Malley's 1 percent.

The close results of the polls highlight the challenges the Clinton campaign faces.

On Wednesday, Clinton campaign manager Robby Mook sent an email to supporters with the subject line “nervous.” The email went on to say that he's “not trying to be dramatic about this situation (I swear! I’m really not!), but there’s a situation developing in Iowa and New Hampshire that could change the course of this election.”

ABC NEWS' Liz Kreutz and Brad Mielke contributed to this report.

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