It looks like Bush, Christie and Kasich are going to tear into Rubio on Saturday night. They all adhere to the belief that the electorate will rally around an establishment candidate (one of that group) so their path to victory is to de-seat Rubio as the leading establishment candidate.
Bush especially hates Rubio on a deep personal level.
This will benefit Trump immensely.
Cruz will be ignored because he doesn’t have good poll numbers in NH.