That's not true.
It may become true if Romney wins the nomination, but McCain had huge problems winning the evangelical vote until he nominated Sarah Palin.
There are reasons he did that.
I can't imagine what Romney, who is a much worse candidate than McCain, will do to get enthusiastic support from evangelicals.
Demographics don't lie. Evangelicals have horrible turnout percentages unless they're highly motivated to vote for a candidate, and in the South, many are former (or even current) Democrats who routinely vote for local conservative Democrats for local and state office. Rich guy Romney hits all the wrong buttons -- Yankee, filthy rich, Ivy League, member of a cult -- to antagonize blue collar and rural Southern evangelicals. I can't see Obama winning lots of rural Southern whites, but I can see rural Southern whites saying there's no point in voting because both candidates are bad.
True, I wouldn't be surprised to see a number of prominent evangelical leaders say that Obama is so bad that we need to vote “anybody but Obama.” But that's not happening yet, it may not happen in large numbers before the nomination, and even if it does, lots of evangelicals are going to sit out the election entirely.
As for me, I'll be voting in November. What I do with the top of the ticket is an open question and I don't yet know the answer myself.
Interesting analysis of the “evangelical” voter, but I was only referring to some postings last night that quoted Gary Bauer, Focus on the Family’s Tony Perkins, the president of the Southern Baptist Convention - some of the religious “leaders” who were previously backing Santorum, who have come out for Romney since Santorums’s dropout.
Haven’t heard anything from Viguerie.
Any of ‘em including Levin could have gone over to Gingrich (or Paul) instead of Romney. But they went to Romney.