Bingo.
I support Newt, I really don't see as there is any other real alternative. On the general principle of stopping Mitt, I suppose I would have voted for Santorum over Romney if it had come down to that in my state's primary - but most other people I know (anecdotal evidence I realize) wouldn't have. While I agree Santorum is more conservative than Romney, I think Rick would lose in a crushing landslide in a general election. The man is too easily baited into talking about things like condoms and porn instead of economic issues - and any candidate, at least where I live, that believes we need a lecture on why contraception is "not okay" is simply out to lunch and doesn't stand a chance in a general election.
I am not at all convinced that if Newt or Rick drop out that all, or even a majority, of his vote would go to the other. Perhaps at first in a state or two, but then the election dynamics would change, all the negative campaigning and media scrutiny would focus on just that one non-Romney and Mitt may do much better in a 2 person race than people think.