Bashar al-Assad, President of the Syrian government, has brutally bombed suburbs of Damascus (where rebel fighters are known to live) with lethal sarin gas killing approximately 1600 people, 40% of which were children. This is an illegal attack using weapons of mass destruction. UN (United Nations) inspectors have verified that sarin was used, and it is assumed that these bombs came in the form a missiles fired by the Syrian government.
President Obama has vowed to retaliate by striking military bases, rocket launchers, and command structures if Syria ever used gas to kill its citizens. However, he's decided to get Congress's opinion on the matter before overriding them; that's assuming he makes the right decision, if the vote doesn't go his way. But, I'm getting ahead of myself.