Kamala Harris was losing on election night in 2010, but after 4 weeks of vote counting she pulled ahead:
Lawrence O'Donnell (2010): "4 weeks after the November 2nd election, California has finally has declared in the Attorney General race. Harris finished so close to her Republican opponent [Steve Cooley] that it took a month to finish counting every vote. She won by less than 1 percentage point."
Steve Cooley (2024): "State law mandated that every ballot had to be counted. All the provisional votes, those that are harvested and dropped off at polling locations were counted. She beat me by .3 of 1%."