(Agencies)
Updated: 2007-12-27 22:04

Though the poll shows little relationship between shifting voters and the issues they consider important, many who left Giuliani put more importance on political corruption than those who still support him. Bernard Kerik, Giuliani's former police commissioner, has pleaded not guilty to federal corruption charges.

Among Democrats, Clinton's large lead over Obama and John Edwards changed little, though polls on Iowa's Jan. 3 caucuses - the nation's first voting - show them in a three-way battle there.

Nationally, six in 10 Obama supporters now say they are sure to stay with him, a gain from last month and the same as for Clinton. Edwards' certain supporters doubled, but only to just more than four in 10.

"She's kind of harsh," Linda Beerhorst, 56, a notary from Osceola, Ind., said of Clinton, whom she has abandoned for Obama. "He doesn't talk like a politician, he talks like your next-door neighbor."

Among Democrats, men were slightly likelier to switch than women, while middle-aged Republicans changed more often than younger or older ones.

The survey of 1,821 adults was conducted from Dec. 14-20, and had an overall margin of sampling error of plus or minus 2.3 percentage points. Included were interviews with 847 Democrats, for whom the margin of sampling error was plus or minus 3.4 points, and 655 Republicans, with a margin of sampling error of plus or minus 3.8 points.

The poll was conducted over the Internet by Knowledge Networks, which initially contacted people using traditional telephone polling methods and followed with online interviews. People chosen for the study who had no Internet access were given it for free.

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