Rep. Tom Tancredo's (R-Colo.) second TV ad of the '08 presidential race, which began airing in Iowa today, suggests that a terrorist attack will result from "spineless politicians" who refuse to address border security and illegal immigration.

A narrator says that jihadist terrorists now "freely roam U.S. soil," and the ad shows images of terrorist attacks in London, Spain, and Russia. It concludes with a fictional terrorist leaving a bomb to explode in a U.S. shopping mall.