I feel like this claim is misleading and false. There doesn't seem to be any other sources to back up the claim that one man is responsible for the failure of the Harris campaign and a social media post isn't the most reliable source to begin with. While he might have had partial responsibility, he himself did not single handedly make all the decisions that caused them to lose. Also the statement that he "killed democracy" is also misleading as democracy is still in tact at the moment and anybody saying something otherwise is just speculation at this point which doesn't hold up for a fact check. Overall, just a misleading claim to say that Garin was responsible for the campaign losing and killing democracy.