His niece, Leslie Robinson, plays forward for the undefeated Princeton team. Leslie is the daughter of Michelle Obama's brother, Craig Robinson.
The first-round NCAA tournament game is being played Saturday in College Park, Maryland.
Obama was accompanied by his daughter Malia, mother-in-law, Marian Robinson, Craig Robinson and other Robinson family members.
Most in Obama's group wore orange "Tiger Pride" T-shirts to support the Princeton team. Obama wore a dark sweater.
Education Secretary Arne Duncan, a former professional basketball player and a Chicago pal of the president, also attended.
The first lady is traveling in Cambodia.
Chance of a shower or T-storm Sunday, otherwise the weekend forecast is looking good.
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