An analysis of January voting records by The New York Times found that nearly 140,000 Republicans had quit the party in 25 states that had readily available data (19 states do not have registration by party). Voting experts said the data indicated a stronger-than-usual flight from a political party after a presidential election, as well as the potential start of a damaging period for G.O.P. registrations as voters recoil from the Capitol violence and its fallout…

The biggest spikes in Republicans leaving the party came in the days after Jan. 6, especially in California, where there were 1,020 Republican changes on Jan. 5 — and then 3,243 on Jan. 7. In Arizona, there were 233 Republican changes in the first five days of January, and 3,317 in the next week. Most of the Republicans in these states and others switched to unaffiliated status…

“Since this is such a highly unusual activity, it probably is indicative of a larger undercurrent that’s happening, where there are other people who are likewise thinking that they no longer feel like they’re part of the Republican Party, but they just haven’t contacted election officials to tell them that they might change their party registration,” said Michael P. McDonald, a professor of political science at the University of Florida. “So this is probably a tip of an iceberg.”