Donald Trump wins New Hampshire's GOP primary. Nikki Haley banks on the upcoming contest in her home state of South Carolina. And mass protests are expected in Argentina against the new president's economic reform plans.Want more comprehensive analysis of the most important news of the day, plus a little fun? Subscribe to the Up First newsletter. Today's episode of Up First was edited by Megan Pratz, Taylor Haney and Olivia Hampton. It was produced by Ziad Buchh, Ben Abrams and Kaity Kline. We get engineering support from Hannah Gluvna. And our technical director is Zac Coleman.