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Eighteen people participated in the official tweet up, according to Obama Foodorama. They were invited into the White House to prepare a healthy meal.

The White House streamed the event on its website, where Obama was seen working in the garden and joking with the kids.

The campaign's Twitter page re-tweeted one participant's description of a moment between Obama and one of the children helping out with the harvest:

The Democrats also promoted the hashtag #AskMichelle as a way to ask the First Lady questions about the campaign.

Michelle ObamaMichelle ObamaKim Kardashian says she and Kanye once sang karaoke with Obama Obama talked trash, won money from 3 celebs over golf game Former Michelle Obama aide enters Maryland governor's race MORE does not have her own Twitter page.