Will a majority of white voters ever vote a minority candidate for President? I know Obama, for a Democrat, did the best among white voters since Carter but McCain still won the white vote.
They will, once the GOP runs a minority for president. The only way a Democrat could win a majority of white voters is in like a 60+% election anyway, and that's not likely.
This. I think it's important to note that Obama likely did win the white vote excluding the South (not positive but I think the margin there as opposed to the total is enough to make that estimation), where McCain won it by 80%+ margins in many states where the parties are quite polarized along racial lines. Thus, either this would need to happen or the South's party politics would need to coalesce along some nonracial dichotomies.