The House GOP majority is hanging by a thread — and political analysts are taking notice. On Friday, House Speaker Mike Johnson (R-LA) was dealt yet another blow when Rep. Mike Gallagher (R-WI) became the latest of multiple GOP lawmakers to announce he would not complete his term, instead saying he will resign effective on April 19. This comes after Rep. Ken Buck (R-CO), another lawmaker who announced his upcoming resignation, thumbed his nose at GOP leadership on his way out the door by joining Democrats’ in voting on aid to Ukraine. Experts were quick to note that Johnson is running out of v…