It's not just that a female pastor preformed a same sex marriage; it's that she, herself, is homosexual as well.
While I do not believe she should be kicked out of the church, we should not be allowing her to LEAD a church body. The vote was something like 11-1 refusing to remove her from her position. To me, that's a pretty clear sign that the Methodist church is headed in the wrong direction. They are more worried about not making waves in the community than in following in the path of Christ.
Would Jesus have been so worried about upsetting people that he didn't scold one of his disciples? Heck, who didn't he upset while he was here? Go read your bible again people! He was sarcastic ("You have such a fine way of rejecting the commandment of God.") he was rude, telling people to shut up and listen, he was even violent (he didn't ask those pesky coin changers to leave the church. He went outside, picked out a nice branch, and forced them out by beating the tar out of them.) Our God is the God who created Mt. Everest, Lions, and asteroids which randomly rain down on earth. He destroyed entire cities for turning their backs on him. Why do we just ignore or pretend that it's OK to be gay and preach that being gay is ok?