UW-Madison students on both sides of the political aisle are making a push to inform classmates of a change in state law that has the potential to prove troublesome to those planning to vote in next month?s recall elections. Under the state?s voter ID law that was enacted last year, one has to establish residency at a given address for 28 days in order to vote from that location. So with UW-Madison?s final exams under way this week — while the showdown between Gov. Scott Walker and Milwaukee Mayor Tom Barrett is set for June 5 ?- students heading out of town for a different summer residence will not meet the 28-day requirement.