Louisiana Senate race
There's still a chance in Louisiana to make the Senate 49-51 (instead of 48-52, which in the long run could be a huge difference; flipping one Republican senator v. two on certain legislation could be crucial). Here's more information: Supporting Foster Campbell in the Louisiana runoff. Maybe a longshot, but for people who are donating things to try to ameliorate the Trump presidency, this seems like a good cause to donate to.