Sen. John Thune of South Dakota is being touted as a “sleeper” candidate to serve as Mitt Romney’s vice president, the Sioux City Journal reported. Thune may be at a disadvantage because he comes from a state with only three electoral votes, South Dakota Democratic Party Executive Director Ben Nesselhuf told the Journal. So electoral strategy might tempt Romney to pick Sen. Marco Rubio of Florida or Sen. Rob Portman of Ohio. Rubio ‘s Florida has 29 electoral votes and Portman’s Ohio has 18. That aside, Thune has qualities to match the job, according to Doug Gross, an Iowa Republican...