There's nothing like a little "mud slinging" in politics, the origins of this come from Rome just like candidates
It dates back to ancient Rome when candidates for the senate wore white togas, inviting mudballs from detractors, says "Isaac Asimov's Book of Facts." The toga of an unpopular figure soon became "toga maculosa" (defiled by mud), meaning he could no longer be a candidate-- literally, "clothed in white." http://www.ohio.com/bj/features/strange/docs/strange000110.htm