https://www.wsj.com/articles/iowa-caucus-results-delayed-by-...
EDIT:
Since this is apparently a “controversial” statement, here is the FEC data proving this is entirely true:
https://www.fec.gov/data/disbursements/?data_type=processed&...
https://docquery.fec.gov/cgi-bin/fecimg/?201912199166621206
Here's almost half a million to consultants from a big group of donors.
https://docquery.fec.gov/cgi-bin/fecimg/?201904159146174550
There's just so many payments and transfers to/from Senate and Presidential campaign and big donors that just go opaque as without knowing what the recipient really did with that money for every candidate that takes donations, this is a very hard problem to answer without a serious investigation by a team of journalists and lawyers.
My comment was in response to someone claiming that all the campaigns in Iowa had funded both groups. There is no evidence of that.