Donald Trump is running away with the nomination because he has performed consistently across the country. He gets roughly the same percentage of the vote in deep red counties as he does in deep blue counties. Ted Cruz and John Kasich don’t. Cruz comes closest to Trump in counties where Obama got under 35% of the vote in 2012 and does much worse in counties Obama won.
Conversely, Kasich does more than three times better in counties where Obama got 65%+ than he does in counties Obama got less than 35%. Trump beats him everywhere.
Combined, Kasich and Cruz have done better than Trump both in places Obama won and lost.
Oh well. Better settle it in Cleveland.