Three amigos

Donald Trump heads into his home-state primary of New York with a large edge over Ted Cruz and John Kasich, 54 percent to 21 percent and 19 percent respectively. The lead, if it holds Tuesday night, would net him the bulk of the state's delegates and put him back on a path -- albeit a narrow one -- to the 1,237 needed for nomination.

Underpinning Trump's lead in New York, as in Pennsylvania and California, is that Republicans believe he would be "effective," "authentic" and that he understands people like them. He leads Cruz and Kasich on these measures, as well as on electability, as Republicans see him as most likely of the three to win in November.

But Trump has been critical of the party's nomination process even as he leads it, and Republican voters in New York agree with him: Fifty-two percent decry the Republicans' system as unfair. Trump's own voters are especially apt to believe this. This comes as Cruz, who trails in the overall race, has reportedly seen his supporters prevail in many of the local and state-level selections to fill delegate slots in recent weeks, which could set up a potential edge for Cruz at the convention this summer if it is contested. Ted Cruz's voters see the system as fair.

The feeling of unfairness could be galvanizing Trump's supporters in these critical upcoming states, as those who see it as unfair are among the most strongly backing him.

Whether that convention is wide open or not likely comes down to California, the last, largest remaining state to vote, on June 7. There, Trump leads Cruz and Kasich as the CBS News Battleground Tracker begins looking at the contest, 49 percent to 31 percent for Cruz and 16 percent for Kasich. At the race's current pace, Trump would need a sizable win there -- as well as strong performances in between -- to clinch the nomination outright.