Not sure how Rand would go about attacking Cruz unless over foreign policy which I'd be all for but Rand seems to go out of h, I'd probably avoid it directly since Cruz is not an ill-prepared guy and is very popular with conservatives in the GOP that we want to win over that are already miffed at Rand. Like Rand won't burn any bridges with McConnell but he doesn't have any problem criticizing the other conservatives in this race? You do realize how this appears? Rand needs to pound Jeb, Rubio, the media, the establishment, he needs to stand out and not be afraid of what the polls say. The polls say his candidacy is dead so there is nothing to lose by advocating the unpopular nonmainstream positions, controversy attracts attention and the voters need educating. Stop trying to be "electable", that is a box that Rand will never escape from. Just showing up and attacking someone above you in the polls doesn't look good very often, we need substance.
Honestly I think an economics debate is going to be tough, people aren't going to disagree with each other rather just try to one up one another. I'm sure they'll be plenty of other questions I guess, Rand needs to take up the anti-war and anti-drug war(which can be framed as state's rights issue mantle full time as part of his campaign. The media making fun of our kooky ideas is better than not distinguishing ourselves, for all Rand's pandering to hawks most who that is important to still think Rand is some limp wristed isolationist like his father. Project confidence, tell them why you are right and they are wrong. Speaking like a vanilla politician trying to juggle support is a ticket to irrelevance. Extremism is no vice in the defense of liberty!