By Steve Tawa

PHILADELPHIA (CBS) — Two familiar faces in President Obama’s inner circle are making appearances in Philadelphia this week.

One is clearly a campaign event. First lady Michelle Obama will be campaigning for Tom Wolf, the Democratic candidate for governor of Pennsylvania.  She’ll appear Wednesday morning at the Emanuel Recreation Center, 8500 Pickering Avenue, in Mt. Airy.

Doors open to the public at 9am. Organizers are giving out free tickets, available at Wolf’s local field offices, in West Oak Lane, Norristown, and South Philadelphia, on a first-come, first-served basis, due to space limitations.

The first lady is enormously popular, and her husband hopes she will motivate Democrats going to the polls next month, as the party tries to maintain its US Senate majority and win governors’ races, including the one involving Wolf, who faces incumbent Republican Tom Corbett in three weeks.

And vice president Joe Biden, himself no stranger to these parts over the years, will be at a Philadelphia event on Thursday highlighting the importance of investing in America’s infrastructure.