Because in the press release where Cruz alleged support from the Eagle Forum, he actually lists them!
Increasingly, with the passage of time revealing more and more of these shenanigans, Cruz appears to be little more than a Mafia lawyer with a rather odd religious bent.
If that's the kind of guy you want for president, have at it.
Me? I think I'll stick with Trump, who at least has real world experience getting things done. He's grounded in reality, has most all of the views I agree with, and displays none of the pathologies Cruz does.
CA....
They list themselves. Cruz's press release includes the text of the letter.
Cruz for President Announces Endorsement from Eagle Forum Activists - January 18, 2016