Former Florida Gov. Jeb Bush Tuesday described the growing economic chasm between rich and poor as "un-American" and called it the biggest "structural" problem facing the nation on Tuesday. "Going forward, we have to deal with our longer structural problems. The biggest one, as far as I'm concerned, is that we're no longer socially mobile as a country," Bush said on MSNBC's "Morning Joe" program. "You have people that are born poor and there's a higher and higher probability that they're going to stay poor. And you have people that are born rich and there's a greater probability that they'll...