To a first approximation, I agree with this tweet from New Yorker writer Ryan Lizza:
But one irony is that the Republican Party finally did seem to be doing a bit of deciding — Rubio received 10 endorsements, including quite a few high-profile ones, between the Iowa caucuses and New Hampshire primary. The failures more came earlier in the election cycle, when the party didn’t do a good job of clearing the field or vetting its candidates. It’s like when you leave for the airport with exactly enough time to get to your gate. Maybe you’ll make it, but you have no one to blame but yourself if you encounter a long security line and miss your flight instead.
