Disclaimer: I would have never voted for either of the flawed candidates that the major parties nominated. I did not vote for Trump or Clinton.
This is a bad idea. First, you are interfering not only with one person’s free will, but the free will of the people who voted for him. In my path it is self-serving and unethical. If you are Wiccan, I suggest it is also self-serving and unethical for you too. If you do this, you are as wicked as those you are trying to oppose. Fighting individual battles on specific issues, offering a clarity spell to those who need it, is not unethical. This is true of my path. The best way to win is through love. Put your ethics ahead of your politics.