Former Secretary of State Hillary Clinton is in a horserace in Iowa, as Sen. Bernie Sanders has refused to fade away with just 67 days left before the first caucus votes are cast in the Democratic primary.

According to a new Quinnipiac poll, Clinton has the support of 51 percent of Democratic voters, unchanged from a month ago. Meanwhile, Sanders saw a 2 percent increase over the month, and now has 42 percent, just 9 percent behind Clinton.

Former Maryland Gov. Martin O'Malley pulled in only 4 percent, and 3 percent were undecided ahead of Thanksgiving.

While Clinton's lead is still significant, the poll shows that Democrats have yet to give up the idea of a challenger to Clinton, who has trust issues for many voters and still has higher unfavorable ratings among the electorate.

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