By Pat Loeb

PHILADELPHIA (CBS) — President Barack Obama will be in Philadelphia on Tuesday campaigning for Hillary Clinton. The president will be promoting voter registration.

President Obama will speak on Eakins Oval at in front of the Art Museum at 1:45 p.m., in an event that is free and open to the public.

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This is the first time Obama will campaign for Clinton on his own — a move that is actually quite rare in presidential politics.

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The president previously appeared with Clinton in North Carolina and headlined a fundraiser for her in August, but on Tuesday he’ll leverage his personal popularity here to try to boost registration and turnout. That’s considered the key to winning Pennsylvania, where Clinton leads in recent polls by an average of six points, thanks largely to Democratic strongholds in Philadelphia and Pittsburgh.

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The campaign recommends arriving early to clear security and notes no signs, coolers, large bags, umbrellas, water bottles, chairs or sharp objects are allowed.