Business tycoon Donald Trump has burst upon the Republican presidential campaign like a loud, over-charged wrecking ball. Many within the GOP establishment, like Karl Rove, have dismissed him as a political joke and a candidate not to be taken seriously. The GOP would be very wise not to follow that advice. Does anyone remember a guy named Jesse Ventura? Jesse "The Body" Ventura was a professional wrestler who in 1998 won the governor's office in Minnesota. Running as an independent, he pushed his straight-talk populism and regular "working class"-guy approach to the fine people of Minnesota. He promised lower taxes,...