“You can’t say the system is rigged but elect these two senators,” said Eric Johnson, a campaign adviser to Kelly Loeffler, one of the G.O.P. Senate candidates, and a former Republican leader of the Georgia Senate. “At some point he either drops it or he says I want everybody to vote and get their friends to vote so that the margins are so large that they can’t steal it.”…

“I had someone message me just last week saying: ‘Nope, I’m done. Can’t trust the election. Never voting again,’” said Buzz Brockway, a former Republican state representative. “The president has a very dedicated group of supporters who don’t really support the broader Republican Party — they support him.”….

Newt Gingrich, the former House speaker from Georgia and a Trump supporter, said that the dissatisfaction with Mr. Kemp and Mr. Raffensperger was so widespread among Republican activists that he anticipated primary challenges against both men two years from now.

“I’ve had very close friends write me and say, ‘I have a Republican governor and secretary of state, and they’re both useless, so why do I stay involved?’” Mr. Gingrich said. “But I think they’ll take pretty active measures to get people to turn out based on the long-term historical importance of these two seats.”