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Many that now enthusiastically support Cruz once supported Rube or Carson.
Both of them were once touted as acceptable choices before they floundered. This is a normal consequence of a large field of choices, but notably every vote that was not for Trump was decidedly anti-Trump. (and they have been a solid majority)
Cruz will not flounder.
Your denial of reality will make your head explode.
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The general isn't the same as the primaries; a GOP candidate needs cross over votes to beat any Dem and the usual fraud.
Trump has brought in MANY disaffected Dems, blacks, blue collar workers, and many others, NONE of whom will vote for Ted; NOT A SINGLE ONE OF 'EM! Some Trump supporters will vote for Cruz...maybe, but many MORE won't, if some strange game is pulled and he winds up the nominee....which he won't; so all of this is moot.
Here is a little denial of reality for you. You do realize after the first convention vote most of the delegates become unbound and can vote how they want to. Meaning even if they say they will vote for Cruz now after the first vote, what makes you think they will? At the point they become unbound, they can keep changing their mind on who to vote for right up until they vote.
So whose delegates are they after the first round?