But even as senior Republicans again coalesced around Mr. Moore, there were reminders that the party’s internal divide over its nominee remained. Mitt Romney, the party’s presidential nominee in 2012, warned that Mr. Moore’s presence in Congress would be “a stain” on Republicans and the country.

“No vote, no majority is worth losing our honor, our integrity,” Mr. Romney wrote on Twitter.

Although Mr. Moore appeared to be regaining important support in his party, some of his accusers pushed back at recent remarks in which he said he did not even know them, let alone behave inappropriately.

It is not clear whether the back-and-forth will do anything to change the contours of the race, which is especially close by the standards of a state where Republicans tend to rout their rivals, but many party officials believe that Mr. Moore has steadied his candidacy and that they should back — or at least avoid further antagonizing — someone who could soon be in the Senate.

Mr. McConnell, for instance, refrained Sunday from criticizing Mr. Moore or repeating earlier remarks indicating that the Senate might expel Mr. Moore if he were seated after numerous accusations of misconduct and unwanted overtures. Nine women have come forward in recent weeks to describe their encounters with Mr. Moore, including a woman who said that Mr. Moore molested her when she was 14 years old.

With the notable exception of Mr. Romney, many national Republicans seem to have shifted their approach: less active criticism of Mr. Moore and fewer threats of his swift expulsion from Congress, and more guarded comments, if any at all. Mr. Trump, though, could prove far more vocal about the race, especially when he appears Friday in Pensacola, Fla., which is within the Mobile, Ala., media market.