There's a constant misperception among Trump supporters in here that anyone critical of Trump is "The Left". Trump is disliked by huge numbers of conservatives and moderates, for varying reasons.
I would predict that in any given election year, you'd see more support in here for whichever candidate is demonstrated to be more qualified, whether by virtue of experience, temperament, policies, debate performance, etc. Unfortunately this year all the leading choices are deeply flawed and unlikeable, so we're seeing more negative arguments against candidates than positive arguments for them.