Summary: Saturday on PBS News Weekend, it's primary day for Republicans in South Carolina -- how will the results affect Nikki Haley's fight for the presidential nomination? Then, as Ukraine marks the second anniversary of the war with Russia, we look at the effect of the conflict on its people and what lies ahead. Plus, the growing problem and health consequences of social disconnection and loneliness. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders
