Illinois Republican Mark Kirk's Senate campaign sought to highlight the positive new TV ad it released last week. Despite continued heated exchanges between the candidates, the 30-second positive didn't mention Alexi Giannoulias, Kirk's Democratic opponent, at all.

"In a country where too many just vote the party line, there are only a few thoughtful, independent leaders who do what's right for us," the female announcer said in Kirk's ad.

But that wasn't the extent of the congressman's new ad campaign. Kirk also released a TV ad last week that hit Giannoulias for wanting to raise taxes. The Kirk campaign did not publicize the ad, but the Giannoulias camp noted its release, saying the move was another sign Kirk "can't be trusted."