Romney still isn't talking about his VP pick

— -- BOSTON—Mitt Romney is still offering no hints about who he'll pick as his running mate, but that hasn't stopped reporters from trying to get something, anything out of the presumptive Republican nominee about his potential vice president.

In an interview with NBC's Chuck Todd, Romney was asked what he hopes his choice of running mate will say about him and what kind of president he will be.

"I certainly expect to have a person that has a strength of character, a vision for the country that adds something to the political discourse about the direction of the country," Romney said. "I happen to believe this is a defining election for America, that we're going to be voting for what kind of America we're going to have."

Romney's interview, which was previewed on NBC Nightly News, is part of a larger documentary about the GOP candidate set to air on MSNBC on Aug. 24.