Roll Call: 116 House Members Sign Syria Letter to Obama (Updated)
It was actually 140 signers on the Rigell letter at the end.
192 Reps., Including 73 Democrats, Call for Debate & Vote Before War With Syria
2013/8/29/1234850/-162-Reps-In cluding-64-Democrats-Call-for- Debate-Vote-Before-War-With- Syria
Here is the text. Note that this happened during the August recess: "Congress can reconvene at your request."