They made the same argument when McCain and Romney won the nomination by relying on Dems and independents. How did that work out in the general?
I wonder what today's Trump supporters were saying about Thad Cochran winning his primary with crossover votes?
They made the argument as a hypothetical based on NO evidence that they were doing so in the primaries. Trump has been winning over those votes in the primaries. Besides that, there is STATISTICAL evidence that hillary is overwhelmingly unpopular with younger voters.
You're using Cochran as part of your argument? That's bizarre. It wasn't crossover votes choosing to do so to nominate the person. It was those darn backstabbers again, getting people who would never vote for them to defeat a true constitutional conservative in the primaries.
If this nomination is stolen from Trump, Republicans will have difficulty winning so much as local dog catcher.