Recently Rubio flubbed "more" and "fewer", saying "more plumbers and less philosophers".
But now he also shows his ignorance of "between you and me":
"The bottom line is there isn't that big a difference between [Cruz] and I on how to approach immigration," Rubio told CBS News on Sunday.
I expect rednecks from Michigan to say "between you and I" but not US Senators, but then again neither Barack Obama nor Donald Trump seems to know it's "secretaries of state", not "secretary of states".
Meanwhile Byron York above shows rather convincingly that it was Ted Cruz voting for stronger border amendments to the Gang of Eight bill in 2013 and Rubio voting against them.