The poll of 1,017 national adults conducted May 8-11 indicates 55 percent of likely Democratic voters say both Sens. Hillary Clinton, D-N.Y., and Barack Obama, D-Ill., should stay in the race.

There was an increase in the percentage of those interviewed who thought Clinton should drop out of the race, however. The poll indicates 35 percent of those interviewed said Clinton should bow out, while a May 1-3 Gallup poll indicated 23 percent stated that opinion.

"People are reacting to all the news coverage since the North Carolina and Indiana primaries, which has been basically saying that it's over," Emory University Professor Alan Abramowitz told USA Today. "At the same time, all along most Democratic voters have felt like, 'Let the voters have their say.'"

A slight majority, 55 percent, say Obama should pick Clinton as his running mate. Clinton supporters back the Obama-Clinton ticket by 73 percent, while 43 percent of Obama supporters are enthusiastic about the so-called dream ticket.

The poll quoted a sampling error of 3 percentage points.