Even if he was completely free of controversy, you’d find something to disqualify him. Maybe even just the fact that he’s white and/or a man. Men are inherently sexist and white people are inherently racist, so either of those characteristics alone would be enough.

But I will concede that there could potentially be a candidate who could be deemed acceptable, but such a candidate would necessarily hold limited appeal to the working class broadly, and especially the white working class, specifically, thus making them not a threat to capital. So, yes, liberals might allow a candidate who fails to meet their unattainable standard, but only if that candidate poses no threat of organizing the working class.