(CNN) – The political group formed from President Barack Obama's presidential campaign has collected more than 1.4 million signatures on a petition urging congressional leaders to reconsider and pass legislation expanding background checks on gun sales.
Organizing for Action collected the signatures online and in-person, and will send the petition to leaders on Capitol Hill Thursday. Rules prevent the boxes of paper from being delivered directly to lawmakers, so names will be sent digitally, and the physical signatures will be shipped to Senate Majority Leader Harry Reid and House Speaker John Boehner.
The petition, addressed to Reid, Boehner, Senate Minority Leader Mitch McConnell, and House Minority Leader Nancy Pelosi, points out an overwhelming number of Americans supporting extending background checks.
"The vast majority of Americans from all corners of the country are united in support of expanded background checks for gun sales," the petition reads. "I'm calling on you to listen to the American people and act to keep guns out of the hands of criminals. It will make our communities and schools safer. Please take action to expand background checks today."
Obama elevated gun control to a top priority of his second term agenda following the December shooting at an elementary school in Connecticut. His push, however, received a major blow in April when the Senate defeated a bipartisan background checks measure. Further legislation putting new restrictions on guns was put on hold.
After the vote, Obama called out senators who opposed the background checks bill, suggesting they were ignoring the will of the people who elected them.
OFA, which actively promoted Obama's gun control agenda in the months leading up to the vote, has made a heavy push for petition signatures through their large email distribution list, which was amassed during Obama's two successful White House bids.
Jon Carson, OFA's executive director, wrote in a message to supporters on Monday, "We'll never be as deep-pocketed or as well-connected as the gun lobby. What we have is better. It's the voices of real Americans who are standing up and saying they've seen enough of gun violence tearing apart communities like Newtown and Tucson and Aurora and Chicago."
Also on Monday, Carson said OFA would expand its field effort now that some lawmakers are discussing bringing gun control back up for a vote in Washington.
That includes additional organizers in what Carson called "targeted locations" to help promote Obama's agenda. OFA currently has paid staff in nineteen states.
"We really think a very important way to change the conversation in Washington is to demonstrate support for the president's agenda out in the states," Carson said.
CNN's Kevin Liptak contributed to this report.