Only if Bleeg is truly so much worse than Flurb that the small tip in the chances of the election is smaller than the good your donation would make for a more worthwhile cause.
Also, advocating for partisan political donations in general in a context where the only effect of those donations is to tip the chances one way or the other is irrational (as opposed to advocating for donations to one side in particular, which could be reasonable if you’re certain enough that side is truly much better than the alternative).
As someone said in the comments to Robin’s post, the same goes for encouraging people in general to get out and vote.
Is it good to prevent bad? If so, should I donate to Flurb simply because I hope to cancel out someone donating to Bleeg?
Only if Bleeg is truly so much worse than Flurb that the small tip in the chances of the election is smaller than the good your donation would make for a more worthwhile cause.
Also, advocating for partisan political donations in general in a context where the only effect of those donations is to tip the chances one way or the other is irrational (as opposed to advocating for donations to one side in particular, which could be reasonable if you’re certain enough that side is truly much better than the alternative).
As someone said in the comments to Robin’s post, the same goes for encouraging people in general to get out and vote.
Yes, you should. But another point is that you probably overestimate the chances that Flurb is good and Bleeg is bad. The magnitude as well.