Whoever ends up on the Republican ticket, they'll still be fighting to win in the same crucial states: Florida, Ohio, Virginia and a few others. Most states will still be firmly in the Republican or Dim column from the start.
I think the issues will determine the winner, and Trump and Cruz are raising more of the right issues than all the others combined.
I think Trump could bring in some of the North Eastern states. Cruz will run the boards in the South, Midwest and South West. Together could be a beautiful thing!