After finishing second in Iowa, chastened Donald Trump has returned to the flock for tonight's debate, conceding that his boycott in principle against mean-girl Megyn Kelly and her Fox News boss might not have served him well in that states caucuses. Tonight's debate should be a yeasty brawl. Trump will accuse Ted Cruz of voter fraud, Jeb Bush of having a Mommy fixation and Marco Rubio of having one canned speech in his repertoire.