Vice President Joe Biden and first lady Michelle Obama are set to stump for Democratic presidential nominee Hillary Clinton at two universities in Philadelphia and one in Pittsburgh.

Biden plans to appear at Drexel University on Tuesday morning, which is National Voter Registration Day.

The Clinton campaign says he will launch a voter-registration drive and urge Pennsylvanians to register to vote. The campaign says Biden’s speech will focus on Clinton’s economic plans. Those interested can sign up online.

Michelle Obama plans to appear at La Salle University on Wednesday. People can sign up online to attend the noon event. She plans to appear at the University of Pittsburgh later that afternoon.