The campaign never stops, not even for President Obama's birthday. He turns 50 on Thursday, and he’ll begin celebrating Wednesday night with a fundraiser in Chicago. He’s expecting a crowd of about 1,000 people—some of whom will have paid as much as $38,500—at the Aragon Entertainment Center to listen to performances by Jennifer Hudson, OK Go, and Herbie Hancock. Before the event, the president will celebrate his birthday with thousands of campaign volunteers via teleconference; he’ll then speak at the Aragon before heading back to Washington. His plans for Thursday are unknown.