The Democrats are composed of various factions, to include the neocon moderates like Hillary Clinton and her gang, along with the neoMarxist left like the Obama supporters and the democratic socialist left like Sanders. The latter two groups do not support this kind of military action in general as they tend to take anti-US perspectives on any international broohahah. The Clinton wing is definitely in favor, though and they align often with the GOP Neocons and Chicken-hawks as well like McCain and that short little kid Lindsey. In the GOP there is also open opposition like Rand Paul and other "America First" types who are against letting an Imperial Presidency develop. So I dont think it is as simple as "The establishents of both parties are in favor of more military action in Syria." The Democrats are being taken over by factions that lean against them, and the GOP is run by a man right now who is also a cynic and skeptic of this idea of the US as policeman of the world. I think we should be patient with our leaders and see the larger perspective over time. Hammering Assad was a good move for his use of chemical weapons and it HAD to be done, IMO , no mater what the political Establishment may think. Sometimes they do get lucky and get something right..