Let me clarify, my friends. I didn't mean that the Maine GOP would kick Snowe and Collins out. I meant that since the national party is moving so far to the right, it will be hard for them to identify with their party and they'll probably either become Independents or the national party will demonize and label them as RINOs (which they already do) so much that they may possible jump ships and join the Democrats, but I think the first scenario is more likely than the latter. Clearly New England Republicans are much more moderate than Republicans elsewhere, and I don't think the mainstream GOP understands that. If the Republicans want to have a presence and a voice in New England, they're going to have to swallow their pride and tolerate the idea of allowing moderates in their party, otherwise the Democrats will completely dominate New England like they already do - Snowe and Collins are the only "Republican" U.S. Senators from New England, there are absolutely no Republicans serving in the U.S. House of Representatives, and Democrats control all the state legislatures and statewide executive elected offices in New England. The only bright spot for Republicans is the Governorships in Connecticut, Rhode Island and Vermont, where these three Governors (M. Jodi Rell, Don Carcieri and Jim Douglas) are also moderates/RINOs/whatever the mainstream party labels them as.
Isn't it funny, though, how these moderate/RINOs (Snowe, Collins, Rell, etc.) are considerably more popular among their constituents than most conservative Republicans, or the "real" Republicans if you will? 
There are really two New Englands, both moving towards the Democrats, but both are for different reasons.
In Massachusetts, Rhode Island, and parts of Maine, the white working class never re-aligned to the GOP. As a result, the GOP has remained the party of wealthy suburbanites, even as those voters have moved massively to the left on social issues. At the same time, most genuine social conservatives are still members of the Democratic party, at least at the state level. Its worth noting that the Democratic Legislative Leadership was far more opposed to Gay Marriage in Massachusetts than the Republican leadership, and until the time of Mitt Romney, the Republicans were arguably the more socially liberal party during the early 1990s.
In Rhode Island the same occurs, and it is catholic democrats who are blocking Gay Marriage. as a result, there is a much weaker Conservative base in the GOP to threaten moderates.
On the flip-side, Vermont, New Hampshire, Connecticut, and Southern Maine are simply either made up of those liberal suburbanites with only minor working class ethnic enclaves to balance them, or are rapidly being taken over by them. As those suburbanites shift, so do those states.
Collins and Snowe have benefited in Maine by the fact that they have close cultural and geographical support bases. Snowe is big on her working-class, Greek background, while Collins focuses on Franco-Americans, and the Democrats have been stupid enough to consistently run wealthy WASPs against them.
