Sen. Rand Paul (R-Ky.) hit back at Sen. John McCain (R-Ariz.) during his speech Thursday at the Conservative Political Action Conference, suggesting McCain's GOP is "stale and moss-covered."

Paul didn't actually mention McCain by name, but the reference was clear to everyone in the crowd after McCain last week labeled Paul and other members of the new generation of conservative Republicans "wacko birds."

"The GOP of old has grown stale and moss-covered," Paul said. "I don't think we need to name any names here, do we?"