"— Trump is dominating among Republicans and GOP leaners who are college graduates, with 46 percent, to 19 percent for Rubio, 13 percent for Cruz, and nine percent for Kasich.
— Trump is dominating among suburban Republicans, with 51 percent, to 16 percent for Rubio, 13 percent for Cruz, and six percent for Kasich. As James Hohmann has reported, Rubio’s strategy is heavily focused on winning suburban areas in many Super Tuesday states and beyond.
— Trump is dominating among Republicans who make $50,000 or more, with 50 percent, to 16 percent for Rubio, 15 percent for Cruz, and eight percent for Kasich.
— Trump is dominating among Republicans who are under 55, with 47 percent, to 17 percent for Rubio, 14 percent for Cruz, and five percent for Kasich. (Unfortunately, the samples are too small to break out younger groups.)"
https://www.washingtonpost.com/blogs/plum-line/wp/2016/02/29/these-new-trump-poll-numbers-should-absolutely-terrify-republicans/?hpid=hp_no-name_opinion-card-e%3Ahomepage%2Fstory