“She definitely made a mistake,” he added.
María Urbina, the national political director of the progressive group Indivisible, said she and other liberal leaders were encouraged by Ms. Warren’s decision to apologize. Going forward, Ms. Urbina said she expected liberal activists to take their cues from Native leaders on whether Ms. Warren had adequately addressed their concerns.
“Native leaders and native people should be the ones to affirm — or not affirm — whether her record shows if she’s been an ally,” Ms. Urbina said. “That’s absolutely important.”
On the campaign trail, there have been relatively large and enthusiastic crowds for Ms. Warren so far, including in states like Georgia and Nevada that are far away from her northeastern base. At every event, she has also held a lottery where questions are drawn at random to answer; she has been asked just more than 100 questions so far, according to her campaign, and two have been about her ancestry.
This does not surprise Neera Tanden, the president of Center for American Progress, a liberal nonprofit group. Ms. Tanden, a former adviser to Mrs. Clinton, said she expected Democrats to stay away from criticizing their own during this cycle.
“There’s a strong belief among Hillary voters that the negativity during the primary hurt her during the general,” Ms. Tanden said. “And people do not want to go through that again.”
This could change, of course, if Ms. Warren were to ascend to the Democratic nomination and went head-to-head with Mr. Trump while coming under intense scrutiny across the political spectrum.
At her Georgia campaign appearance, a group of conservative protesters gathered across the street from the Central Gwinnett High School gymnasium in Lawrenceville, where Ms. Warren was speaking. “1/1024th chance of winning,” read one sign, in reference to the small portion of Native American ancestry Ms. Warren’s DNA test revealed she could have. During the event, too, one heckler loudly accused her of lying; Ms. Warren brushed aside the comments and went on with her remarks.