Paul is just as electable as Cruz.
Then explain his advantage in CO, IA, and somewhat NH. No, he is very much electable. He can appeal to the youth (his dad's massive army), moderates, and conservatives at the same time. A new poll also showed he would get a little less than a quarter of the black vote, which is huge. I can also see him making a play for ME-2.
His stance on the Civil Rights Act/Southern Avenger, Personhood etc. will come back to haunt him he will become less appealing once his views are known. People only know about his stances on civil liberties issues and little else.