It's not a question of doing both, it's a question of campaigning (not just voting) and social movements. People keep thinking “why can't people vote and do social movements?” when it reality it's actually a question of campaigning and social movements.

Some people really don't participate in campaigns, focus on movements, and still vote, that's the ideal, but what we are actually seeing is not that. What we are seeing are movements being stripped mined for votes through campaigning. To endorse is to campaign, to campaign is to defend. Under normal conditions there's little wrong with that. But these are not normal conditions. Defense of the candidate means defense of the program and that program means genocide for Palestinians and trans people, concentration camps for migrants, militarization of police, mass death, mass ecocide, and mass plunder. Harris stands for all of these.