Clinton and Sanders neck and neck in Iowa

With less than three weeks until ballots are cast in the Iowa caucuses, Democratic presidential rivals Hillary ClintonHillary Diane Rodham ClintonChris Murphy’s profile rises with gun tragedies DNC, RNC step up cyber protections Gun proposal picks up GOP support MORE and Bernie SandersBernard (Bernie) SandersChris Murphy’s profile rises with gun tragedies Clip shows Larry David and Bernie Sanders reacting after discovering they're related For now, Trump dossier creates more questions than answers MORE are neck and neck in the Hawkeye State.

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Clinton maintains a 2-point lead, within a new Bloomberg/Des Moines Register poll's margin of error, with 42 percent to Sanders's 40 percent. Clinton saw a significant drop from her 9-point lead when the same question was asked last month.

This is the closest Sanders has come to overtaking Clinton in Iowa.

The tightening race — and Sanders’s slim lead in New Hampshire — has been accompanied by more antagonistic campaign rhetoric.

Clinton has gone after the Vermont senator for his votes on gun-related bills, calling him a “reliable vote for the gun lobby.”

Sanders fired back, saying Clinton’s attack was “mean-spirited” and “unfair” and pointing to his D-minus rating with the National Rifle Association.

He also said Clinton’s more aggressive tone is a sign that her campaign is in “serious trouble.”

Martin O’Malley places a distant third in the new poll, with 4 percent support. Fourteen percent of respondents said they are still uncommitted or not sure whom they will support.

The poll of 503 likely Democratic caucusgoers, conducted Jan. 7–10,  has a margin of error of 4.4 percentage points.