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It was the last conference to do so.
http://sports.espn.go.com/ncf/news/story?id=4314921
"... The Mountain West believes it has no choice at this time but to sign the agreements. If a conference wishes to compete at the highest levels of college football, and the only postseason system in place for that is the BCS, no one conference can afford to drop out and penalize its football programs and student-athletes."