The candidate responds to Clinton’s RFK comment on his flight from Puerto Rico to Chicago.

Calls remark “unfortunate,” adds:

“I think that when you’re on the campaign trail for 15 months, you’re going to make some mistakes. I don’t think Senator Clinton intended anything by it, and I think we should put it behind us.”

Also talks about McCain’s age, Florida delegate, gas prices and his own hybrid car. Watch video, and read transcript.