No one who doesn't get 1,237 delegates before the Convention is guaranteed anything. After the 1st Ballot, most delegates are unbound to any candidate and can vote for their preferences. And despite all the crossover Democrats who have been padding Trump's wins in so many Open voting states, the delegates at the Republican Convention will be Republicans. If Trump goes to the convention without 1,237, which is a very good possibility, and he and Cruz are remotely close in # of delegates - also a very good possibility - then Trump will be at a decided disadvantage at the convention, where only Republicans can vote.
Not sure why you say the "divide is larger now". Trump still can't break 50%, and Cruz's vote % has been going up. Arizona didn't fully account for Carson and Rubio dropping out, because Arizona voters had been Early voting since February 24. Over 75,000 votes were cast for the two of them, and they weren't even in the race on Election day. Cruz's share of the Election day vote in AZ was much closer to Trump than the final result including Early votes for multiple candidates that weren't still in the race.
Trump also just lost Utah - the most Republican state in the nation - to Cruz by 55 points.
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