Interesting imagery. The idea of border security only seems over-the-top to those folks that have grown comfortable with our national decline into a balkanized multi-culti cesspool of "many nations in one". But if you're right, and it's an aversion to border security that has sent Republicans to McCain in droves, then I guess we never really had a chance did we?
You're making the same mistake. There are other, probably much more effective ways of taking care of border security that don't involve something as stupid as a long wall which has the unfortunate effect of doing nothing about the illegals who are already here.
As an alternative, why not attack the problem on the money side of the equation? After all: illegal immigrants continue to come here, because Americans are paying them to do it. If you took all that "wall money" and instead spent it on registration and tracking, and enforcement against those who employ illegals ... that's where you'd really make some progress, because it directly addresses the problem at its source.
But the "Wall" folks are the loudest in the room. Which is really too bad, when you get right down to it.