For the first time, polls also generally find support for impeachment tying or modestly outstripping opposition. FiveThirtyEight’s impeachment tracker, which aggregates the polling from a number of outlets, puts support for impeachment at about 47%, with opposition at about 45%. At the beginning of September, average support stood at about 39%, with opposition near 53%.

The polling doesn’t offer a total consensus about exactly who are changing their minds on impeachment. A number of surveys, including initial HuffPost/YouGov polling, found that the movement was due mostly to Democrats, who followed their party’s leaders in coalescing around support for an inquiry. Others, however, also found rising support among independents or even Republicans.

Democratic backing for impeachment is increasingly verging on the universal, with most polls finding three-quarters or more in support. In the most recent Quinnipiac survey, 90% of Democratic voters said Trump “should be impeached and removed from office,” and 95% favored the Democrats’ impeachment inquiry. If support for impeachment is to continue to grow much further, it’ll also need to make inroads beyond just the party ― a path that’s complicated by the already-polarized reactions to Trump’s conversation with the leader of Ukraine.