President Trump likes to complain about “Fake News.” So, here’s some very real news for him: Republican control of Capitol Hill and the White House is based on a “fake majority.” “A majority of the Senate now represents just 18 percent of the nation’s population,” David Wasserman, an editor for The Cook Political Report, wrote in a recent New York Times column. He added that the crucial Senate seats this November would be “much whiter, more rural and pro-Trump than the nation as a whole. In effect, geography could again be Mr. Trump’s greatest protector: After all, the Senate —...