TODAY Exclusive: Craig Melvin sits down with Republican primary candidate Nikki Haley on the campaign trail. Also, NBC Business and Data Correspondent Brian Cheung breaks down Valentine’s Day by the numbers. Plus, the story behind a wedding tradition in Pittsburgh involving baking that spans decades. And, Kinglsey Ben-Adir, Lashana Lynch, and Ziggy Marley live in studio ahead of the release of their new movie “Bob Marley: One Love.”