Look.
I am not for Romney.
I just think we have a better shot at controlling him than Obama.
How are we going to control him when he's the team captain?
If you want a mutiny (and you surely had better want one), you stand a far greater chance of one getting started under a captain that the whole crew hates with a passion, than you do with one who half the crew is lamely trusting to do the right thing.
Republicans will probably become the majority in both the House and Senate this year. They will lock arms against an avowed enemy (Obama), but they will play nice with someone who they view as the leader of their own party.
Obama and Romney have near-identical records in office. There's hardly a dime's worth of difference between them. If Romney is elected, we stand a far greater chance that Obama's Socialist agenda will go forward, than if The Great Evil himself is in office still pushing it against the opposition party in Congress.
This is the fundamental dynamic at work here. It's not pretty to look at, but if you have any intention of winning in the long term, you have to face that, and strategize accordingly.