Okay so now they have a 'reverse time' quantum part/tool now. And now it's going to be used in quantum computer error correction??? Golly! Well, we're still a long way from a time machine for humans. Zaps from a Laser Could 'Reverse Time' on the Quantum Scale https://www.insidescience.org/news/zaps-laser-could-reverse-time-quantum-scale Physicists show how switching positive and negative charges in graphene could make the first quantum time mirror.
First of all, who would you trust to have a time machine? for example, if hillary clinton had one, you would not want to be donald trump, and, vice versa, yes? then, the idea about truly travelling back in time is silly - you will travel back to where the time machine was being assembled, yes?
Time machines don't alter elections. If they both had them then they could try to out do each other, but it would extend to doing ludicrous measures and counter measures to affect the election, it wouldn't even be worth it except to play multiverse tag. It doesn't matter where the time machine leads. The past, present, and the future are all happening at once and affecting each other like ripples and waves flow in the water.