According to the Cook Partisan Voting Index (CPVI), Virginia’s Congressional District 2 (CD 2) is the nation’s ultimate “median” district. By Cook’s rating, 217 of the country’s 435 congressional districts are regarded as more Democratic and 217 as more Republican.  That places Virginia CD 2 firmly among 36 Ballotpedia “battleground” districts and among 22 “tossup”…