We saw that where they needed to cheat more intensely in order to steal the election were a couple counties in 5 or so states. And as I remember, there was this car-bomb in Nashville that exploded on a AT&T central hub (most likely a NSA surveillance hub) and it brang down mobile phone signal and mobile internet throughout most of the east coast.
No need to nuke the entire system if you just have to put down a central node and the rest falls apart like dominos. What are your guesses ? Mine are all locations of Amazon, Facebook and Google server farms.
I also remember that the car had a loudspeaker that told people to stay away and that it was going to blow. What kind of terrorist attack is that. These people are stupid, and have gotten even worse since 9/11.