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.
“If you presume to love something, you must love the process of it much more than you love the finished product.”
“I'm going to keep making films I believe in. Whether I am successful or not is besides the point.”