I started a thread about this (tangentially) a few hours ago.
I don’t mean to sound “Both Sides”-ish, but as someone who visits a wide variety of liberal and conservative message boards (such as Democratic Underground or TigerDroppings), one could literally take selected posts/comments, delete the keywords to conceal identity, and make people play a guessing game - “guess who posted this, a liberal or a conservative?” and people would really miss 50% of the time.
“We are the side that is too wobbly while the other side is stalwart and united as a bloc”
“The other side cheats and plays dirty and has no qualms, we are too honorable and nice”
“Our opponents will stop at nothing to destroy America, nothing is beneath them, they have no shred of decency”
“We are soft, they are hard and sharp”