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Santorum up in Colorado, Nevada with anti-Gingrich commercial

Fresh on the heels of announcing January fundraising numbers in excess of $4 million, Rick Santorum's presidential campaign announced a new television ad that will begin airing Tuesday in Colorado and Nevada.

The ad attacks Newt Gingrich as being too liberal for the GOP nomination by arguing that he shares many policy positions with President Obama and House Minority Leader Nancy Pelosi (D-Calif.).

"All three supported radical cap and trade legislation that would destroy American jobs and drive up energy costs. All three supported giving illegal aliens some form of amnesty. All three sported the government health mandates which take away our freedom and is the core of ObamaCare. And all three of these politician's supported the Wall Street bailouts that was a slap in the face to the Tea Party," the narrator says.

It goes on to refer to the trio as "cap and trade loving, bailout supporting, soft on immigration, big-government mandating politicians."

The commercial is a sharp indictment of Gingrich, with whom Santorum has split more conservative voters in early primary contests. But the ad does little to attack Mitt Romney, the presumptive Republican front-runner who is expected to lead in Nevada polling.

"Rick Santorum for President: he doesn't just talk a good conservative game, he lives it," the narrator says.

Nevada will caucus Feb. 4, with Colorado voters gathering 3 days later at caucus sites across that state. Ron Paul, who also has essentially conceded the Florida primary, is also campaigning early in those two states.