They can't do this without the Christian Right. In 2010, white Evangelicals constituted 34% of the turnout.
Romney can't win the South without the Christian Right.
And his only win in a primary in 2008 & 2012 outside of his home turf is Florida & AZ...FL due to the elderly vote...
A lack of enthusiasm for Romney may enable Obama to reprise his 2008 victory by winning VA, NC, and FL. However, political analyst Michael Barone notes that Romney has shown strength among affluent suburbanites that could reprise pre-1992 strength in the ring counties around the Northern metro areas. Fear of higher taxes and socialized medicine would outweigh the social issues that drove many middle income suburbanites in the Northeast and Midwest away from the GOP in the 1990s and 2000s.