Kavanaugh, Roberts, and Barrett were on Bush's legal team for Bush v. Gore (I think Barrett was actually on Jeb's arguing his authority to stop the recount). Thomas was in the majority ruling. Alito will 100% join the "Trump wins." The best bet is Gorsuch switching and then Roberts believing that throwing away all the credibility when they have a 6-3 majority just for a Trump reelection isn't worth it