Romney is a Gentleman Republican. As such, and as Dole and Senior Bush and Ford and McCain before him, he demands the honor of the Republican nomination but as for the election, well, he’d rather not actually have to be President. Republicans believe in their hearts that the Democrats are the natural Ruling Party and Republicans exist to help raise taxes for their programs and occasionally provide more efficient management for them.
As the senate is the upper house and the house of representatives the lower house in congress, so is the Democrat Party the upper party and Republican Party the lower party in the political arena and each knows its place.
They are both branches of the same political crime syndicate, The Establishment!!!