Hillary Clinton’s campaign is starting a file of “dirty campaign tricks” after a handful of supporters reported that negative information about the Democratic presidential candidate is being peddled by telephone.

Two Iowans reported so-called push polls, where the unidentified callers pretended to be opinion pollsters but instead did little more than bash Clinton. Two other Iowans reported feeling badgered by callers who said they were from the Obama campaign.

Separately, a caucusgoer who is registered as a Democrat told The Des Moines Register that a push poll Monday evening targeted Hillary Clinton, Barack Obama and John Edwards, in that order.

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