I personally cannot support Schweitzer for his record (or lack thereof) on gay rights. I want to support the first president who's unapologetically pro-marriage equality in the next election. Democrats have beat around the issue for too long.
Democrats need to move away from focusing on liberal social issues like that; its hurting our prospects with working-class voters. If anything, we should be moving more towards the center. Schweitzer has been a super-popular governor; I don't think one issue, especially one as divisive as that, should be a deal breaker.