Is libertarian rock star and Texas Republican Ron Paul going mainstream? He’s got everyone from South Carolina Republican Sen. Jim DeMint to Minnesota moderate Democrat Collin Peterson to California liberal Barbara Boxer on his side in his audit-the-Fed crusade. He’s drawing liberal support in his push to rein in the cost of the war in Afghanistan. Senate candidates like Democratic Rep. Paul Hodes of New Hampshire are finding Dr. No’s populist economic anger to be useful in the campaign, echoing Paul’s criticism of the Federal Reserve. “This brought people together [from] the whole political spectrum, from progressives and liberals and...