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 ClintonFBI’s top lawyer believed Hillary Clinton should face charges, but was talked out of it Harris adds key Clinton aide, women of color to 2020 campaign: report Democrats more likely Trump's foil, than to foil Trump MORE and Bernie SandersBernard (Bernie) SandersBernie Sanders to sign pledge affirming he will run as a Democrat Overnight Health Care — Presented by National Taxpayers Union — Drug pricing fight centers on insulin | Florida governor working with Trump to import cheaper drugs | Dems blast proposed ObamaCare changes Hillicon Valley: Microsoft reveals new Russian hack attempts | Google failed to disclose hidden microphone | Booker makes late HQ2 bid | Conservative group targets Ocasio-Cortez over Amazon 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.