House Speaker Mike Johnson (R-LA) is widely expected to survive Rep. Marjorie Taylor Greene’s planned motion to vacate next week, when some Democrats are predicted to pitch in and save him, but that may be merely a Pyrrhic victory, cautions Charles R. Davis. Why? According to the Salon writer’s Wednesday column, Johnson’s career could be effectively over. “Johnson has claimed support from former President Donald Trump, publicly dismissing Greene, an ally of deposed Speaker Kevin McCarthy, as fundamentally unserious,” Davies writes. “But as CBS News noted, three votes from disgruntled Republica…