Bush, Congress at record low ratings: Reuters poll

New Mexico Gov. Bill Richardson and Delaware Sen. Joseph Biden drew the support of about 3 percent each.

For Republicans, former New York Mayor Rudy Giuliani led the 2008 field with 26 percent, while newly minted candidate Fred Thompson, a former senator and Hollywood actor, was second with 24 percent.

Arizona Sen. John McCain was third at 13 percent and former Massachusetts Gov. Mitt Romney was fourth with 7 percent.

In both parties, about 20 percent of likely voters said they had not made up their minds, leaving plenty of room for the races to shift.

The national telephone survey had a margin of error of plus or minus 3.1 percentage points.

(To read more about the U.S. political campaign, visit Reuters "Tales from the Trail: 2008" online here)