Leave your feedback Share Copy URL https://www.pbs.org/newshour/show/sunday-may-25-2014 Email Facebook Twitter LinkedIn Pinterest Tumblr Share on Facebook Share on Twitter Sunday on the NewsHour... On this edition for Sunday, May 25, President Obama makes a surprise visit to Afghanistan. Margaret Warner reports from Kiev with the latest on the presidential election in Ukraine. In our signature segment, what can the U.S. learn from Mexico's battle against obesity? And, on Memorial Day Weekend, a U.S. veteran who has brought back the art of tintypes. Listen to the Broadcast Subscribe to the Full Show Podcast Segments From This Episode Candy tycoon Poroshenko wins Ukraine presidential vote Soldier documents experience in Afghanistan in tintype photographs Can Mexico’s health program teach the U.S. to lose weight?