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Garrett Jackson, Romney's "body man," is the source of some of the most reliable behind-the-scenes information on the GOP ticket. He tweeted the first picture of Romney and Ryan together before the announcement. 

And he later tweeted a photo of Romney teaching Ryan his method for his favorite snack.

This is apparently something Romney shares with both his VP choices and other likely contenders for the position. On Tuesday, Jackson tweeted a photo of Romney sharing the same snack with Sen. Rob PortmanRobert (Rob) Jones PortmanOvernight Cybersecurity: Equifax security employee left after breach | Lawmakers float bill to reform warrantless surveillance | Intel leaders keeping collusion probe open Reddit hires first lobbyists Senate panel approves bill compelling researchers to ‘hack’ DHS MORE (R-Ohio).

"We're peanut butter folks, if you can't tell already," Jackson told NBC News earlier this summer. 

Follow Jackson for more inside-the-bus tweets @dgjackson. Ryan's new "body man," Jake Kastan, does not appear to have a Twitter account.