I doubt that. The left has a lot invested in their mantra and have basically won the case that there were no WMD's in Iraq because the Iraq Survey Group(ISG) did not find any and the administration did not push the point that there was likely WMD transfer to Syria.
The Administration has no way to prove the Syrian angle short of another war and they do not have support for one.
The only other way that proof might be obtained would be a high level Syrian defector with evidence that would be convincing. Per General Sada:
Iraq's WMD Secreted in Syria, Sada Says
"..Mr. Sada said that the Iraqi official responsible for transferring the weapons was a cousin of Saddam Hussein named Ali Hussein al-Majid, known as "Chemical Ali." The Syrian official responsible for receiving them was a cousin of Bashar Assad who is known variously as General Abu Ali, Abu Himma, or Zulhimawe..."
Obviously as an arch war criminal, Chemical Ali won't talk. He has nothing to gain. The Syrian, General Abu Ali, is inaccessable. You can bet any transfer to Syria would have been handled by the most diehard members of the Syrian regieme and even if one did talk he would not be believed, especially by those who are so invested in the notion that Iraq had no WMDs. I doubt that most of them actually believe Iraq did not have them. I believe the worst. They use this to attack the war and the administration.
Also please take a look at the map in post#34 of my thread