A few options. My channel lineup shows the game on Comcast Sports Net West, MSG, and Altitude (woohoo, I know I'll get it on altitude). Of course, if you subscribe to ESPN full court then it's on there too.
But, if TV isn't an option for you, then you can watch the game online using ESPN's free preview of full-court online:
http://proxy.espn.go.com/ncb/fullcourt/index
Fire Up Marquette!