Tight, tight, tight:

Among all Iowa Democratic voters, Clinton draws 31 percent, followed by Obama (25 percent) and Edwards (21 percent). But among likely caucus-goers, Obama enjoys a slim lead, polling 28 percent to best Clinton (24 percent) and Edwards (22 percent). Bill Richardson is the only other Democratic candidate to score in the double digits (10 percent).

Still, the poll suggests that Clinton’s supporters may be the strongest of the pack. A majority of her boosters (55 percent) say their support is “strong,” edging Obama (41 percent) and Edwards (37 percent). Neither Clinton’s gender nor Obama’s race seem to be a sticking point for Iowa Democrats; 94 percent of voters say they would be willing to vote for either a female candidate or a black candidate. But only two thirds think the country is ready to elect a woman (63 percent) or African-American (66 percent) president.

If Clinton loses Iowa to Obama, everything changes. Matt comments on the poll here.

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