Romney's best hope is if Barrack blows away Clinton early, which it appears he isn't, because McCain is a much better canidate against Hillery.
You do realize that hot button issues that can bring republicans out to vote are going to be off the table right wrl? Do you know even a majority of democrats are against amnesty for illegal immigrants? Having mccain as the nominee you are going to neutralize a lot of hot button issues that would serve to otherwise embolden the republican electorate.
Tax cuts, immigration, campaign finance reform.... mccain is taking all of that off the table.