Yes, they would, and that's the whole problem with the Fantasy Football approach to the 2016 primaries so many here are bought in to.
Suppose it comes down to Cruz or [insert your fave here] and Christie [or Jeb]. Further suppose that, with endless effort and superb coordination, we win in June 2016 at a divided convention.
Does anyone here doubt, doubt FOR A SECOND, that the next day Christie (or Jeb) would endorse Hillary? Does anyone doubt FOR A SECOND that if Hillary looked weak in the polls that she would choose Christie (or Jeb) as VP on a "national unity" ticket to turn back the racist, homophobic Faux News candidacy of Cruz [or Palin, or Mike Lee]?
That's why we need a split. Because even if we win the GOPe game, playing by the GOPe rules, we lose.
You mean like Richard Lugar coming into GA to endorse the new Democrat Nunn.