Sen. Mary Landrieu Mary Loretta LandrieuBottom line A decade of making a difference: Senate Caucus on Foster Youth Congress needs to work to combat the poverty, abuse and neglect issues that children face MORE (D-La.) was spotted helping a man do a keg stand at a Louisiana State University tailgating event on Saturday.

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A photo from the event appears to show Landrieu—one of the most vulnerable Democratic incumbents this year— holding the keg's spigot while a young man dressed in the Tigers' purple and gold does a handstand on the keg and other participants hold his legs. A crowd of onlookers cheers him on.

A source close to the campaign said the man was in his late 20s and was enjoying a tailgate with his friends and family. The source also said his father was at the tailgating party with him.

Keg stands are common events at college campuses. The goal of doing one is to drink as much as possible while doing the hand stand.

But the image will raise eyebrows given worries over binge drinking at universities.

Landrieu is in a tough race against Rep. Bill Cassidy (R-La.) and other Republicans, and the seat is crucial to both party's Senate majority hopes. The chair of the Energy and Natural Resources Committee, she will face off against her GOP challengers in the party's all-party jungle primary on Election Day in November, but with no one expected to reach 50 percent the race will likely go to a December runoff.