A few notable quotes from the article follow:
“A Super Pac affiliated with Robert F Kennedy Jr, the anti-vaccine conspiracy theorist running for president as a Democrat, owes half its cash to a longtime Republican mega-donor and Trump backer, according to campaign finance reports filed on Monday.”
… and further…
“Kennedy’s campaign attracted a considerable amount of support from Republican donors in the weeks since he announced his run in April. A political watchdog found that Kennedy has a “long history” of antisemitism, racism and xenophobia.”
https://www.npr.org/2022/11/11/1135878576/the-democrats-strategy-of-boosting-far-right-candidates-seems-to-have-worked
The TLDR; Democrats raised money for far right candidates during their primaries in some strategic elections, the idea being that given the choice between a sane moderate democrat and a lunatic maga republican in the general election, people would choose the sane option.
I don’t know that is what’s happening here however, even if they threw a massive amount of money at Robert F. Kennedy Jr it seems unlikely he would ever win the democratic presidential primary.