"He could have gotten behind an immigration bill, but getting behind this immigration bill, another cooked-up-in-a-backroom you’ve-got-to-pass-it-to-find-out-what’s-in-it monstrosity was a mistake. His second mistake, and the really fatal one, has been expressions of contempt toward his base. Suggesting that people who don’t support his bill are racist, and that American workers are dumb, is political poison. And his staff should know better than to say this kind of thing to any journalist, however friendly-seeming. All in all, a really disappointing performance from Rubio."
But why did the Freshman arrive at this hubris? How did he get into this position in the "Gang of 8" from which he could do this overreaching?
Seeing where he is and knowing that it was the insane, inane hopes that conservatives reflexively projected onto him, he understandably views this base as at least rather dumb and a tad racist.