The Obamamania that gripped college campuses two years ago is gone. An Associated Press-mtvU poll found college students cooling in their support for President Barack Obama, a fresh sign of trouble for Democrats struggling to rekindle enthusiasm among many of these newest voters for the crucial midterm elections in three weeks. Forty-four percent of students approve of the job Obama is doing as president, while 27 percent are unhappy with his stewardship, according to the survey conducted late last month. Hoping to rekindle campus enthusiasm, Obama planned to appear Thursday at a youth town hall being shown live on MTV, BET and other networks. He also is to lead a rally Sunday at Ohio State University, and in recent days he headlined a massive gathering at the University of Wisconsin and a webcast town hall at George Washington University.