Is it More Difficult to Fix Votes, With Counters/Entrance/Exit Polls?

With entrance/exit counters from different candidates, is it more difficult to fix votes? Even with the machines? Or, is it still just as simple?

I would expect the rigged polls, machines, and propaganda to make it easier, not more difficult. The impedement seems to be the potential threats of other candidates and their influence.

I actually recently caught Clint Curtis’ testimony on youtube and the browsing afterward led me to quite a few documentaries on the subject that I will now be looking to watch..

Uncounted: The New Math of American Elections

Murder, Spies & Voting Lies: The Clint Curtis Story (which I think is an expanded verson of a shorter film titled Truth in the Booth)

Enternal Vigilance: The Fight to Save Our Election System

How Ohio Pulled It Off

Stealing America Vote by Vote