I was surprised to find this out. I wonder why he sold out? From his wikipedia page:
In college, Coleman was a liberal Democrat and was actively involved in the anti-war movement of the early 1970s.<27><28> He once was suspended for leading a sit-in protest.<29> He ran for student senate and opined in the school newspaper that his fellow students should vote for him because he knew that, "These conservative kids don't fuck or get high like we do (purity, you know)... Already the cries of motherhood, apple pie, and Jim Buckley reverberate through the halls of the Student Center. Everyone watch out, the 1950s bobby-sox generation is about to take over."<11><28>
While running for mayor in 1993, Coleman wrote in a letter to the City Convention Delegates: "I have never sought any other political office. I have no other ambition other than to be mayor." He goes on in the same letter to say:
I am a lifelong Democrat. Some accuse me of being the fiscal conservative in this race — I plead guilty! I'm not afraid to be tight with your tax dollars. Yet, my fiscal conservatism does not mean I am any less progressive in my Democratic ideals. From Bobby Kennedy to George McGovern to Warren Spannaus to Hubert Humphrey to Walter Mondale — my commitment to the great values of our party has remained solid. http://en.wikipedia.org/wiki/Norm_Coleman