Why are Democrats and Republicans pushing us into war in Syria?

In 2002 President Bush took his case against Iraq and WMD to Congress and the U.N. He had bi-partisan and international support; he had intelligence going back years into the Clinton Administration. Obama has done none of that except to draw an imaginary red line about WMD and he's been fuzzy about that. Yet Democrats who originally supported Bush and later lied and feigned outrage, have been silent about Obama's duplicity, lack of leadership, and now arming rebels who are al-qaeda lite. Obama is taking us into another war, one in which we have no national interest. Where are the outraged Democrats? Why are Republican hawks like John McCain and Lindsey Graham playing along? Where are all those Republicans who switched parties so they could vote for Obama because Bush had failed them?