Mark Leibovich, Annie Lowrey, and Alex Wagner talk about the Iowa and New Hampshire primaries. Who will moderate Republicans back if the race becomes a Trump vs. Cruz contest? And could Bernie Sanders upset Hillary Clinton early on?

Mark Leibovich, Annie Lowrey, and Alex Wagner try to interpret Ted Cruz’ appeal to GOP primary voters in Iowa, while Donald Trump’s doctor has issued the candidate a flawless bill of health. We also express our sympathy for the Obamas, who will spend hours shaking hands with well-wishers this...