The 2014 and 2016 elections determine how Congress will vote on a Syria strike . Possible White House contenders have political messages . Splits exist in both parties on ideological and political grounds . Passage by the Democratic-led Senate is more likely than in the Republican-led House , but both parties lack unity on the issue so far . Legislators fear backing military action could bring primary challenges .
The 2014 and 2016 elections determine how Congress will vote on a Syria strike . Possible White House contenders have political messages . Splits exist in both parties on ideological and political grounds . Legislators fear backing military action could bring primary challenges .