Cruz is a good man. Keeps his word, which is a little bewildering to many!
I do think, however, that his poll results are accurate. It's more an indictment of the voters than one of Cruz.
Look - you support Trump first, with a great deal of enthusiasm.
Others support Cruz with the same enthusiasm and do the same as you do - get the word out. It's over a year til the actual election - if the average voter in the USA is anything at all like the average voter here, they won't even begin to think much about the election until their own primary comes around. Maybe not even until this time next year!
This is where Trump, Carson and Fiorina are at an advantage right now - they are different. Not your usual politician, so the press is unusually interested in them.