I believe ONLY the conference tournament champions will be given auto-spots in the tournament, but it's very very unlikely that a game in the voter top 25 will miss the tournament, just because the voters usually have a good grasp on strength and performance.
--
http://i259.photobucket.com/albums/hh293/zukiraphaera/war-sig-1.png
http://i.imgur.com/FII1z.gif