Republican presidential candidate John McCain chats it up with TV host Letterman

Republican presidential nominee-to-be John McCain sparred with TV talk show host David Letterman during a taping of his "Late Show."

Letterman joked during his monologue that the senator from Arizona reminded him of "the guy at the hardware store who makes the keys" and of "the guy who can't stop talking about how well his tomatoes are doing."

After he added that McCain looked like "the guy who points out the spots they missed at the car wash," the senator appeared on stage.

"You think that stuff's pretty funny, don't you?" McCain asked.

He tossed at Letterman: "Well, you look like …