If you were a Carson supporter, would you take some Cruz operative telling you Carson was dropping out, vote for Cruz.
These things are essentially impossible to prove.
Kind of like how many Bush votes were lost when the MSM called Florida for Gore before the polls in the panhandle were closed.
If Carson was serious about Iowa he wouldn’t have left on the eave of the voting and none of this would have happened.
This is entirely a Carson self inflicted wound.