Flash is unclear on the concept. In a post in which he waterboards context (where the hell is the ACLU when you need it?), he states:
Common sense Republicans aren’t allowed to vote their constituency or their conscience.
Er, Flash? They voted their conscience.
And then their district GOP voted theirs.
Parties – grassroots activists – get to do that. Granted, as a DFLer you may not be used to thinking for yourself, but it’s kinda what we do on the GOP side.