Obama was able to win the Democratic nomination, by beating Senator Hillary Clinton in the Democratic primaries. However, once elected, Obama included Clinton in his cabinet as the Secretary of State, giving her the top position in charge of U.S. foreign policy. Hillary Clinton was among the most interventionist members during her tenure at the Senate. She had voted in favor of the Iraq war in 2003, whereas Senator Obama had voted against it. Clinton was a strong advocate of U.S. military interventions, including the NATO mission in Libya in 2011.
Along with Clinton, Obama also had Samantha Power in his immediate foreign policy team. Samantha Power was a scholar famous for her works on genocide. She was a strong advocate of use of military force in promoting global peace and humanitarian purposes.