Potential Dem Presidential nominee John Edwards is trailing in matchups against potential GOP rivals Rudy Giuliani and John McCain, according to a new Rasmussen Reports poll. It finds Giuliani ahead of Edwards 50%-41%, and McCain leading Edwards by a smaller margin, 47%-43%. Edwards does hold a significant lead over GOP Presidential hopeful Mitt Romney, 51%-34%. Of course, there are plenty of reasons to think that these numbers don't mean a thing in the real world.