It does.

Democrats want Biden to win the election. Haley being nominated makes that harder.

If they don't want her to be nominated, they're not going to help her get nominated, are they?

5 second google:

A POLITICO analysis shows the former South Carolina governor is winning swaths of moderate voters who’d pick Joe Biden if Donald Trump wins the GOP nomination.

https://www.politico.com/news/2023/12/09/haley-electability-trump-biden-polls-00130926

GOP’s Haley attracts non-Republicans ... also regularly attracts swing voters who backed President Biden in 2020 ... Leaning into her appeal to the political middle on the trail, Haley highlights surveys that show her leading Biden by double digits — 17 percentage points in one recent Wall Street Journal survey

https://www.washingtonpost.com/elections/2023/12/18/nikki-haley-democrats-republicans-presidential-2024/

43 percent of Haley backers in the state said they would vote for Biden if Trump is the GOP nominee ...

https://thehill.com/elections/4408071-almost-half-of-haley-supporters-say-they-would-vote-for-biden-over-trump-iowa-poll/

Democrats acknowledge Haley could pose more of a threat to Biden than Trump, so they are tying her to the former president on virtually every issue ... Democrats privately acknowledge that she would likely represent a worrisome opponent for Biden, citing polling that shows the former governor as the best-positioned candidate to unseat the sitting president in the general election.

https://www.msn.com/en-us/news/politics/nikki-haley-may-be-a-longshot-but-dems-already-know-how-they-would-run-against-her/ar-AA1kGLsN