Giuliani goes on air in New Hampshire

Rudy Giuliani launched a new radio ad today in New Hampshire, where polls show he is closing the gap on Mitt Romney in the Republican primary race.

The former New York mayor hits on familiar themes in the 60-second spot: that he was tested in the fight against terrorism on Sept. 11, 2001, and the aftermath of the horrific attack on his city, and that he is the strongest GOP candidate for the November 2008 election.

"I've been tested in a way in which the American people can look to me. They're not going to find perfection, but they're gonna find somebody who's dealt with crisis almost on a regular basis and has had results, results people thought were impossible," Giuliani says in the ad, titled "Tested."

In a CNN/WMUR poll released last week, Giuliani's support among likely Republican primary voters rose to 22 percent, just behind the 23 percent for Romney, whose support dropped 10 percentage points since July despite a barrage of TV ads. Giuliani, who is campaigning in New Hampshire today, leads in national polls.

"Rudy Giuliani," the announcer says at the end of the ad. "The Republican that Democrats just don’t want to run against."