Following Senate Minority Leader Mitch McConnell’s Wednesday, February 28 announcement that he plans to step down later this year, many are wondering who might step up to replace the longtime Republican leader. The Washington Post reports, “Although no one has officially announced a bid to replace McConnell, a handful of lawmakers are widely seen as potential successors. Coincidentally, the three most likely successors are all named John.” The first contender is Senate Minority Whip John Thune (R-SD), who’s served as a senator for nearly two decades, the Post notes “is the No. 2 Republican in …