A major Democratic donor was arrested this week by the Sex Crimes Unit in Portland, Ore., for raping a minor. Terrence Bean, a liberal activist who bundled more than $500,000 for Obama’s 2012 reelection campaign, is charged with having sex with a 15-year-old boy. Bean has made contributions to influential Democrats such as Hillary Clinton, outgoing Senate Majority Leader Harry Reid, Assistant Senate Majority Leader Dick Durbin and Rep. Barney Frank, who has had his own smarmy brushes with the law. Bean’s Instagram account shows him on Air Force One with President Obama and getting chummy with Vice President Joe...