Yeah probably, remember McCain was never the darling of the Republican party, which earned him the maverick name. His work on Illegal Immigration reform, and the Party of 6 caused alot of hatred by Republicans for McCain. Now if you break it down to his policies, yeah alot of Obama's policies are just seen as too left by too many on the right to swallow it, especially after how the Bush years ended with all the bail outs.
Pfft of course! Who wouldn't?!