Certainly they are a left leaning site and anti war but they are listing members by name so I presume any inaccurate report would be corrected.
The current tracking has 223 in the No or Leaning No camp with just 39 in the Yes/Leaning Yes camp and the rest undecided/unknown.
Of course things can change but this does not bode well for the proposed Syria vote and raises question of what President Obama will do if the House says no