The debate over whether to intervene militarily in Syria is the final break in a long-splintering relationship between Obama and the antiwar movement.
Antiwar activists played an important role in the president’s 2008 campaign, helping Obama defeat Hillary Rodham Clinton in the Democratic primary and Republican nominee John McCain in the general election.
But five years later, a broad coalition of liberal groups that make up the antiwar movement is more likely to oppose the president on foreign policy.
And with Syria, they successfully pressured Democrats on Capitol Hill to defy Obama, weakening him the process.
http://www.washingtonpost.com/politics/syria-situation-further-strains-obamas-relationship-with-the-antiwar-movement/2013/09/13/06c9b0f2-1bb9-11e3-a628-7e6dde8f889d_story.html