Yes, I'm sure the Obama campaign would love to defend their support for the racist drug war. I'm sure they'd love to defend drone raids all over the planet, and extrajudicial assassination of Americans. I'm sure they'd love to have to defend involvement in Libya. I'm sure they'd love to defend their support for the PATRIOT Act, warrantless wiretapping, and indefinite detention.
Ron Paul may or may not beat Obama, but he would certainly make Obama sweat bullets.