Leftist/Statist Democrats so desperately want the Republican Party and Conservative movement to be a white dude's club that ethnic minorities and women who escape the Democrat plantation are treated as traitors. Leftists are much more threatened by liberty-lovers such as Clarence Thomas and Sarah Palin than they are by radical Islamic terrorists. The Islamo-fascists just want to kill Americans, but Thomas and Palin are a threat to Democrat identity politics which is the primary method by which they achieve and wield power.
Doug Patton has a great piece on Human Events about the Left's pathological hatred of ideological "traitors."
"The Rise of the Conservative Woman" by Doug Patton