Some democrats do look for birds of a feather in gun control issues.
http://www.facebook.com/dgocofmo
http://www.bluesteeldemocrats.org
The first link obviously isn't much help other than moral support if you don't live in MO.
And the number of states with Blue Steel Democrats organizations is small. But if one is a liberal Democrat looking for a home to roost, there's a link on their page about how to start a local chapter.
Every bit helps.