Sit-In Organizers Call for 'Day of Action' on Gun Control Wednesday

New guerrilla tactics from Democrats in Congress might be showing the first signs they're here to stay.

Rep. David Cicilline and other Democrats who led last week's 25-hour sit-in are calling for a "National Day of Action" Wednesday to reiterate that they won't quiet down until Republicans in the House allow a vote on gun control measures.

In a letter that The Hill reports was sent to Democrats in the House on Friday, they claimed the sit-in was a game changer.

"Our sit-in showed that the Republican Leadership can no longer ignore the epidemic of gun violence," the Democrats wrote. "A movement was born and will only continue to grow."

Rep. John Lewis, the civil rights leader and figurehead of the sit-in, also signed onto the letter.

"We ask you to join us in a National Day of Action on June 29, 2016," they wrote. "While you are back home in your District, you can continue to build the momentum and engage your community. Whether it is a press conference, roundtable, or telephone town hall, we encourage you host an event showing that Democrats in Congress will keep up the fight against gun violence."

The Democratic sit-in got widespread attention and yet was a bust, in that it failed to win a vote on "no fly, no buy" legislation in the Republican-controlled House. But Cicilline shared the text of the letter on Twitter, declaring, "We have not yet begun to fight." It sounds like the minority party is in a never-surrender mood.

In the Senate, in response to the Orlando mass shooting at Pulse nightclub, Connecticut's Chris Murphy succeeded in getting a vote after staging a filibuster. But his proposal failed to win enough votes for universal background checks that close loopholes for gun shows and online purchases, and a proposal from California's Dianne Feinstein that would stop anyone on the terrorist watch list from buying a gun without the FBI's review also failed.

Compromise legislation being drafted by Republican Sen. Susan Collins of Maine is still in play, though.

Some Democrats have already announced Wednesday events, with Rep. Lloyd Dogged planning an event in San Antonio, Tx., with Moms Demand Action for Gun Sense in America.

Come Wednesday, Democrats will see whether the sit-in energy can spread outside of Washington, as Democrats wait for the House to return in July from a break.

"We look forward to working with you as we continue our fight to bring commonsense, bipartisan, gun violence prevention legislation up for a vote," the Democrats wrote. "Together, we can give voice to the overwhelming majority of the American people who want to see their Congress take action to help keep our communities safe."