Jeb Bush narrates Marco Rubio's latest ad

Marco Rubio is aiming to kill his political opponents with kindness — their own kindness, to be exact. The Florida senator's latest campaign ad features nothing but his fellow Floridian rival for the GOP nomination Jeb Bush raving about his former protégé:

"I'm a huge Marco fan," Bush says in one clip. "He's probably the most articulate conservative on the scene today." In another, Bush describes Rubio's "hopeful, optimistic message based on our principles" as essential to the Republican Party and lauds his "high voltage energy" and "eloquence."

But these days, Bush doesn't seem to be singing Rubio's praises. During a recent Republican presidential debate, Bush said that Rubio should start showing up to work three days a week "or just resign." Rubio responded: "I don't remember you ever complaining about John McCain's voting record. Someone has convinced you that attacking me is going to help you."

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In the ad above, though, Rubio doesn't actually say anything in response to Bush's comments. He doesn't really need to.