The midday rally was one of several planned in cities across the United States today and ahead of larger planned protest in Washington on Monday.
"Congressional offices are being flooded with calls, faxes and emails," said Sarah Sloan, of the ANSWER Coalition -- the group organizing the protest -- in a statement before the demonstration.
"Congressional officials report that by a margin of 100 to one, people are telling the elected representatives from their district that they should vote no on the war resolution," she added.
The protests were held with the nation sharply divided over President Barack Obama's efforts to launch military strikes to punish the regime of Syrian President Bashar al-Assad for alleged chemical weapons attacks against his countrymen.
Obama declared in his weekly address today morning that "we cannot turn a blind eye to images like the ones we've seen out of Syria." He was briefed later in the day by his Chief of Staff Denis McDonough on the latest consultations with lawmakers about an impending vote on military action there, according to a White House official.
Congress reconvenes on Monday, and Obama addresses the nation the following day about a possible US response to the August 21 attack that left hundreds dead on the outskirts of Damascus.
