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(CNN) -- With the presidential election more than two years away, a CNN poll released Monday suggests that nearly half of Americans would "definitely not vote for" Sen. Hillary Rodham Clinton, whose name repeatedly tops lists of potential 2008 Democratic candidates.

Respondents were asked whether they would "definitely vote for," "consider voting for," or "definitely not vote for" three Democrats and three Republicans who might run for president in 2008.

Regarding potential Democratic candidates, 47 percent of respondents said they would "definitely not vote for" both Clinton, the junior senator from New York who is running for re-election this year, and Sen. John Kerry of Massachusetts, the party's candidate in 2004. (Poll)

Forty-eight percent said the same of former Vice President Al Gore, who has repeatedly denied he intends to run again for president. (Watch why the list of potential candidates is ridiculously long -- 2:25)

Among the Republicans, Sen. John McCain of Arizona and former New York Mayor Rudy Giuliani fared better than the Democrats, and Florida Gov. Jeb Bush fared worse.

Only 30 percent said they would "definitely not vote for" Giuliani; 34 percent said that of McCain.

As for Bush, brother of the current president, 63 percent said there was no way he would get their vote. The younger Bush has denied interest in running for president in 2008.

Among all choices, Clinton had the highest positive number; of those polled, 22 percent said they would "definitely vote for" her.

Giuliani was next with 19 percent, followed by Gore with 17 percent, Kerry with 14 percent, McCain with 12 percent and Bush at 9 percent.

This telephone poll of 1,001 adult Americans was conducted June 1-6 by Harris Interactive for CNN. The poll had a sampling error of plus or minus 3 percentage points.