In a turn of events that should come as a total surprise (to no one), it looks like Working Families Party’s endorsement of Elizabeth Warren was a straight pay-for-play deal.
Elizabeth Warren’s daughter, Amelia Warren Tyagi, is Chairwoman of Demos, a liberal think tank.
Per Demos’ 2018 tax filing, they gave $45,000 to the Working Families Party. This was the first year Demos gave anything to WFP.
The 990 that’s screenshotted in this tweet is here: https://www.demos.org/sites/default/files/2019-05/2018%20990%20Public%20Disclosure%20Copy.pdf