Michigan State University passed the $1-billion mark this week in its private fund-raising campaign, the Campaign for MSU, making it the third public university without an on-campus medical research center to break the mark, according to Charles Webb, MSU vice president for university development. The University of California , Berkeley , and Purdue University in West Lafayette , Ind. , are the other two schools. The MSU fund-raiser, which launched its public phase in 2002, had set a goal of raising $1.2 billion by 2007.