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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 PortmanGraham calls handling of Kavanaugh allegations 'a drive-by shooting' Overnight Health Care: Senators target surprise medical bills | Group looks to allow Medicaid funds for substance abuse programs | FDA launches anti-vaping campaign for teens Bipartisan group wants to lift Medicaid restriction on substance abuse treatment 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.