Gingrich tests scathing new anti-Romney video

Newt Gingrich stepped up his scorched-earth strategy against Republican rival Mitt Romney on Wednesday with a biting new internet video that features a string the former Massachusetts governor's political gaffes.

The video is an unrestrained attack on the party's front-runner at a time that some of Gingrich's fellow Republicans are questioning the wisdom of his strategy, considering few in the party give the former House speaker much chance of winning the nomination after poor finishes in the Iowa caucuses and the New Hampshire primary this month.

The video is titled "For the Dogs," and features, in one snippet, Romney discussing with a television interviewer a much-recounted anecdote in which Romney strapped his dog, who was housed inside a kennel, to the top of the family car during a trip. Romney explains in the interview that the dog liked the kennel and that the inside of the car was crowded with his five children.

The montage includes footage of several other Romney missteps, including this week's comment that he "likes to fire people" who provide him with poor service, his earlier remark at a campaign event that "corporations are people," and his now famous debate offer to rival Rick Perry of a $10,000 bet.

It ends with words on the screen reading, "Imagine what Obama would do with a candidate like that. Only Newt Gingrich can win the debates against Barack Obama. Mitt Romney can't." The final scene is of Romney, with a small group of voters, playfully recalling lyrics from the pop song "Who Let the Dogs Out?"