It’s not just the United States Senate that switched political parties on Election Day. Ben Carson, the neurosurgeon and conservative phenomenon who rocketed to fame when he challenged Barack Obama at a prayer breakfast last year, also officially changed his political affiliation, moving from independent to Republican. The step is another indication Carson may run for president in 2016. Carson, whose career was spent as a doctor at Johns Hopkins University Hospital in Maryland, filed the paperwork in his new home county of Palm Beach, Florida, a traditional Democratic Party stronghold. “It’s truly a pragmatic move because I have to...