Furthermore, you can have an outsized impact by letting your congressperson know why you're voting for / against them. Better yet, form a group with like-minded

Furthermore, you can have an outsized impact by letting your congressperson know why you're voting for / against them. Better yet, form a group with like-minded colleagues and speak as a group. A vote "against" without communicating intent doesn't drive recourse in the way you would like. "X is the most important issue to me this election cycle, and will determine whether I vote for you and donate to your campaign" is clearer and more powerful.