Yes
Last Idaho poll in March had Cruz at 17%
Cruz won with 45%
Polls are used to influence voters, The left is trying to push Trump because they know he has no core values and they can beat him in general, plus get what they want out of him
Watching cable news this morning, see no one pushing Trump.
Fox, on the other hand, is promoting Cruz, going so far as to say Cruz had a big night, really impressed by Idaho. No mention or credit given to Romney.
FWIW, the last poll I saw of Idaho was a local news station showing Trump +11.