It's not merely that conservatives are better at selling their product, or that they happen to have an easier-and undoubtedly simpler-ideological product to sell. It's that they know what they are selling. Liberals in general and Obama in particular cannot say the same.
“I'm completely Americanized - I have an American accent, an American wife - but a residue of me is foreign.”
“Will he get a place for his oldest boy? He can not. His girl? Why, the Chinaman is in her place too!”