GOP delegate math says Trump not inevitable

Despite Donald Trump's string of victories on Tuesday, he has to do better in upcoming contests to claim the Republican nomination for president before the party's national convention this summer. Ted Cruz is emerging as the candidate who could stop him — with a little help from Marco Rubio.

Despite Donald Trump's string of victories on Tuesday, he has to do better in upcoming contests to claim the Republican nomination for president before the party's national convention this summer. Ted Cruz is emerging as the candidate who could stop him — with a little help from Marco Rubio.…