According to MSNBC, the reason for the overwhelmingly opposition is because Obama is black.

Via Gallup:

Americans’ support for the United States’ taking military action against the Syrian government for its suspected use of chemical weapons is on track to be among the lowest for any intervention Gallup has asked about in the last 20 years. Thirty-six percent of Americans favor the U.S. taking military action in order to reduce Syria’s ability to use chemical weapons. The majority — 51% — oppose such action, while 13% are unsure.

Americans also opposed military intervention in Syria in a May Gallup survey. In that poll, by 68% to 24%, Americans opposed military action “to attempt to end the conflict” if “all economic and diplomatic efforts fail to end the civil war in Syria.”