McCain was selected by open primary crossover votes. The democrats thought [correctly] he would be the easiest to defeat.
He also had the virtue of not being a natural born citizen. This was a double bonus, he couldn’t raise the question about their boy wonder without shooting himself in the foot, and in the unlikely event of him winning they could beat him like a rented mule over his non-nbc status.
Unlike the current occupant, everyone would have standing to pursue court cases, and the Constitutional eligibility issue would be a topic of wall-to-wall coverage by the MSM, and be a daily topic of discussion in the democrat dominated congress.
I doubt they’d ever actually get around to actually impeaching him (president Palin??? The horror!!!), but he’d be rendered totally ineffectual.
Open primaries. Let your party’s opponents select your candidate. Brilliant.
. . . which is precisely what California is voting for now. As you say, brilliant.