Chris Matthews called "birthers" "crackers" on his Friday show.
Matthews used the term while speaking to Politico's Jeanne Cummings and the Huffington Post's Sam Stein. He was discussing the attacks on President Obama.
"So much of this attack on Obama has been ad hominem -- directed at the person, the president," Matthews said. "Whether it's somebody, some cracker out there on the right calling him -- some birther type that he's not an American or it is someone a little more sophisticated, but basically saying he's a socialist."