Marco Rubio continually loses his way and forgets that the main stream of American society is feeling alienated and disenfranchised. And it seems that Rubio can be bought and will change, chameleon-like, depending on who he is talking to and what he hopes to benefit from them.
Of course, the biggest mistake he made is with the Gang of Eight and the amnesty program. He made common cause with Democrats who want lots of new Latino voters who will be Democrats for life if they are given amnesty. He did this to unite with big business, which means donors, who want cheap labor. He ignored the fact that millions of illegal immigrants are flooding the country, taking jobs that Americans will do, taking lots of government services, and disrupting societies and standards. There is no attempt to assimilate, only to impose. Rubio later tried to explain after it cost him his credibility, but he was caught lying. His believability has sunk to new lows, and now he has decided to throw in with another group that is not interested in assimilating. He is simply digging a bigger and bigger hole.
Rubio against U.S. citizens again, page 2:

No not at all nothing moral in play either
F**k gun ranges, don’t let the slime in our country. Islam is not a religion. They are vile dirty people.
Hey Rubio!!!! It is neither you idiot!!!
Only United States Citizens should be allowed the use of a Firearm!! That means Thoroughly Vetted Little Marco!!
Don’t care, what you think, Marco, none of your business!!
Like hell it is!!!!
are you f—— nuts
you are delusional. glad you dropped out.
It is wrong and immoral to allow Muslims to exist in our Republic.
NO ON THIS ISSUE HE IS RIGHT. MUSLIMS ARE NOT TO BE TRUSTED. JUST LOOK AT WHAT HAPPENED IN CALIFORNIA, AND ALMOST HAPPENED IN TEXAS. MOSQUES ARE A BREEDING PLACE FOR TERRORIST AS THE FRENCH.