... foreign policy knowledge/background/experience under their belt. And to me it looks like Warren is not setting her self up for a run in 2016.
Compare Senator Warren's committees: Committee on Banking, Housing, and Urban Affairs, Committee on Health, Education, Labor, and Pensions, Special Committee on Aging
https://en.wikipedia.org/wiki/Elizabeth_warren#Committee_assignments
To those of Obama's when he was a U.S. Senator...
Senator Obama's committees
Obama held assignments on the Senate Committees for Foreign Relations, Environment and Public Works and Veterans' Affairs through December 2006.[89] In January 2007, he left the Environment and Public Works committee and took additional assignments with Health, Education, Labor, and Pensions and Homeland Security and Governmental Affairs. He also became Chairman of the Senate's subcommittee on European Affairs. As a member of the Senate Foreign Relations Committee, Obama made official trips to Eastern Europe, the Middle East, Central Asia and Africa. He met with Mahmoud Abbas before Abbas became President of the Palestinian National Authority, and gave a speech at the University of Nairobi in which he condemned corruption within the Kenyan government.
https://en.wikipedia.org/wiki/Obama#Committees