I am also a Maine transplant (Lewiston) and former UMaine Black Bear. I race Masters in New England and see many college Jersey's - but never UMaine. Bates is the only Maine school I have seen racing. There are 3 racing clubs in Maine that I know about based in Lewiston and Portland. Here are some websites. I hope this helps you.

http://www.mainecyclingclub.com/2005/05_membership.html

http://gorhambike.com/site/page.cfm?PageID=478

http://www.portlandvelo.com/

http://www.bikemaine.org/