McCain and Obama trade barbs over Cuba, a preview of the fall campaign?

John McCain says Barack Obama's suggestion that he'd meet with Fidel Castro's successor is "dangerously naive,''and shows he's not ready for prime time.

Obama, who made the comment at a Thursday night debate with rival Hillary Clinton, rapidly returned fire, saying McCain means "four more years of the same Bush-McCain policies that have failed U.S. interests and the Cuban people for the last 50 years.''

Though neither man has wrapped up his party's nomination, the volleys over Cuba policy provide a glimpse into what is shaping up to be their lines of attack: McCain will present himself as an experienced, steady hand and criticize Obama's lack of foreign policy experience; Obama, if the Democratic nominee, will present himself as a fresh start and McCain as a return to the Bush years.

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