Although he plans to serve out the rest of his term, Sen. Mitch McConnell (R-Kentucky) is stepping down as GOP leader in the U.S. Senate. And it remains to be seen not only who McConnell’s replacement will be, but also, whether that person will be Senate minority leader or Senate majority leader. Democrats currently control the U.S. Senate under the leadership of Majority Leader Chuck Schumer (D-New York), but Republicans need only a net gain of two seats in November to flip Congress’ upper chamber. The seat presently held by Sen. Joe Manchin (who isn’t seeking reelection) in deep red West Vir…