It was something along the lines of "Our next President will be a woman, the only question is whether it'll be me or Kamala Harris". In one sentence, she was able to highlight
- Trump's unelectability
- Biden's age/health/obvious mental decline
- Kamala's unpopularity
- The identity politics card of her sex
Whether or not you agree that Trump can't win, that Biden is unlikely to finish his second term, whether the public dislike of Kamala is deserved or what you think of Nikki using identity politics while railing against identity politics, the fact she could get all four impressions into one sentence by implication alone is pretty impressive.