They care about appearing to care about it. In reality if they don't think you'll vote the right way they just prevent you from voting, like with a vaccine passport or an ID card. (See? Both sides covered)
If you nevertheless are certain that that was or is the goal of one of the US's two major political parties, then you've reached a perplexing conclusion based on, I can only guess, no evidence, evidence imagined, evidence misunderstood, or evidence contained in a source that should be tossed into the garbage can.