For just the third time since 1950, a sitting United States president will visit the University of Wisconsin-Madison campus Thursday. Regardless of political affiliation, the event will mark a significant day for the university. Around campus and across the city, anticipatory buzz is building. Facebook and Twitter have exploded since the news broke Saturday that President Barack Obama would reschedule his planned trip to Columbus, Ohio and instead visit Madison. And still two days away, on-the-ground preparation has begun in earnest.