Sen Cruz took on Iowa with a great ground game and spent some cash to coordinate that effort, and it was a must-win; even had he won in NH (which was implausible), he had to win Iowa. He had a shot in SC -- as his 'bots here on FR kept reminding us beforehand that it's an open primary (irrelevant since the Demwit side isn't going uncontested) -- and put in some effort, possibly less than Rubio, probably less than Kasich (odd choice for Kasich, unless he was counting on a major upset second place finish), and still came in second, so, really not bad. He won't do that well in Florida, probably, but as pointed out before, the field is in three parts -- Trump, then Cruz/Rubio (and formerly /Bush/Christie), and everyone else (now down to Kasich/Carson). Cruz is now in direct battle with Rubio, and so will be Kasich (from opposite flanks of course). Carson's percentage of support will probably remain steady, and he'd better be ready to endorse someone, because he probably won't be on the ticket (neither will Jeb, he rejected the idea of being Trump's running mate).
Cruz will be unmasked in less than 72 hours.