David Jackson

USA TODAY

Who doesn't like a good joke about Chicago voting?

Even President Obama, a product of the Windy City, cracked wise Tuesday night about its reputation for less-than-legal electioneering.

Reminding supporters in Milwaukee that Wisconsin allows early voting, Obama said, "you can vote all week -- I mean, you can only vote once ... This isn't Chicago, now."

As the crowd chuckled, Obama quickly added: "I'm teasing Chicago. I'm messing with you ... That was a long time ago."