As chief foreign affairs correspondent Andrea Mitchell is charged with reporting on the diplomatic beat for all NBC News platforms. This week, that has meant covering Sen. Barack Obama’s overseas trip and his meetings with heads of state. She has appeared on the Today show and Nightly News every day this week. She also reported for the weekend editions of those shows last Saturday and Sunday. And she continued to anchor her 1pmET hour on MSNBC, with Mika Brzezinski or Contessa Brewer back at MSNBC HQ reporting the other news of the day.