They may not know which party forced them to buy extremely expensive health insurance which is mostly worthless until you have spent an additional thousands of dollars towards the deductible or take an almost equally expensive penalty, er uh tax, of thousands of dollars for some if they don't buy the insurance. Many people don't have a few spare thousand dollars laying around to afford the tax and they certainly don't have the extra thousands of dollars for the insurance.
Or which party created a law that decimated the old health system and replaced it with one where you lose your doctor of 20 years and have to drive across town, where premiums are skyrocketing, where you are forced to buy coverage that you would never use, etc. etc. and worst of all we are worse off than before Obamacare.