McCain remains in the lead with 39 percent of the vote, while Romney is just three points behind at 36. Meanwhile, former Arkansas Governor Mike Huckabee and Ron Paul are in the single digits.
Compared to a Survey U.S.A. poll 1 week ago, conducted before Rudolph Giuliani withdrew from the contest, McCain is up 2, Romney is up 11. McCain had led by 12, now by 3, within the survey's 4.4 percent margin of sampling error.
On the Democratic side, Hillary Clinton appears to be fending-off a late charge from Barack Obama. The exclusive poll by Survey U.S.A. has Clinton beating Barack Obama 53 percent to 41 percent. With John Edwards out of the race, Clinton has gained four points since last week's poll and Obama is up another three points.
Other pollsters show the contest closer.