Rudy is No. 1 in two new national polls.
WASHINGTON (CNN) – Two new national polls released Tuesday indicate former New York City Mayor Rudy Giuliani continues to lead the field of Republican White House hopefuls, but former Massachusetts Gov. Mitt Romney has gained ground in both polls.
Giuliani leads Romney and former Tennessee Sen. Fred Thompson by at least ten points in both surveys.
A CBS News poll conducted August 8-12 has Giuliani on top with 38 percent, followed by Thompson at 18 percent and Romney with 13 percent. Thompson dropped seven percentage points since last month while Romney gained five percentage points in that same time. The number of Republicans who say they are satisfied with their candidate choices has increased 16 percent since June, a finding that may account for Romney's uptick in support and Thompson's decline.
"It's possible that Thompson's delay in officially announcing his candidacy has given Romney the opportunity to get a second look from Republicans, and perhaps some of them are starting to like what they see," said CNN Polling Director Keating Holland.
The CBS News Poll surveyed 302 Republican primary voters and carries a margin of error of plus or minus six percentage points.
In a separate poll conducted August 9-12 by American Research Group (ARG), Romney gained six percentage points since July to tie Thompson for second place at 16 percent. Both trail Giuliani who tops the poll with 27 percent.
But The ARG poll shows Giuliani's support dropping slightly, while the CBS Poll shows the former New York City mayor gaining ground. The difference between the two polls may be due to Newt Gingrich, who was included in the ARG poll but not in the CBS survey. That difference makes it difficult to directly compare the two surveys. Since Gingrich has not entered the race, the CBS poll may be a better indication of the current state of the GOP race.
The vast majority of interviews for both surveys were conducted before Romney won Saturday's Iowa Straw Poll, so it's unlikely that his win influenced the results.
Yet even with his gains, Romney and the rest of the field continue to stare at Giuliani's back.
"Most Republicans continue to associate Giuliani with 9/11 and his record as New York City's mayor," said Holland. "That's a positive image that the other GOP candidates will have to work hard to overcome."
The ARG poll surveyed 600 Republican primary voters and carries a margin of error of plus or minus 4 percentage points.
– CNN Senior Political Producer Sasha Johnson