Wonderful Comcast doesn't carry ESPNU...
Isn't there an ESPN Zone on the 16th Street Mall? I seem to recall that I watched a Marquette game there last winter.
Jackson's sports rock is a nice place to watch games (it's also the location of this years National Marquette Day in Denver...)
http://www.jacksonssportsrock.com/
Even though I've got ESPNU, I'll probably be at the Pumphouse Sports/Brew Pub in Longmont (downtown, on 287) - stop by an I'll buy you a pint. I'll be the guy there cheering for Marquette :P