The ouster of House Speaker Kevin McCarthy last year by a handful of renegade Republicans triggered weeks of chaos and paralysis in Congress. But that’s nothing to how bad it would be if House Speaker Mike Johnson gets the boot now, election forecaster Harry Enten told CNN’s John Berman on Wednesday. This comes as Rep. Marjorie Taylor Greene (R-GA) is threatening to call such a vote if Johnson moves ahead with mounting pressure to vote on renewing defense aid to Ukraine — something he has resisted for weeks under threats from GOP hardliners, but is increasingly searching for a compromise on to…