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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 PortmanRob PortmanTrump talks big on trade, but workers need action Trump tax plan prompts GOP fears about deficit Overnight Regulation: Senators call for 'cost-effective' regs | FCC chief unveils plans to roll back net neutrality 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.