The game show “Twenty-One” had a scandal in the 1950s because they were giving some of the contestants the questions prior to broadcast.
A network that gives the questions to a candidate or party prior to a debate is rigging the debate.
A rigged debate is a rigged election.
I believe it was in the 2004 election, some network was "testing" its graphics for presentation of results. The "test" accidentally got displayed on TV before the voting began. All but a couple of the results for senators, congressmen, etc. were not only the correct winners, but also had the percentages to within 1% or so. It was completely creepy.
Does anyone remember what came of that?