News flash! The US is still a republic, not a monarchy, and the GOP won the 2010 and 2014 midterms by wide margins. You'd never know it from reading this board, but Obama is
very unpopular among the public at large, which is why his name is barely mentioned in the Dem debates and repeated all the time by the GOP.
As for whether Congress can stall Obama's nominee: they damn well can, and it would serve him right. Obama has been unbelievably contemptuous of Congress, especially his second term. As Obama himself said, "elections have consequences." Or put another way, what goes around comes around.