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PHILADELPHIA (CBSMiami/AP) — The mother of Trayvon Martin, and several other mothers who lost children to gun violence or excessive police force, took center stage at the Democratic National Convention Tuesday night.

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The Mothers of the Movement not only includes Martin’s mother Sybrina Fulton, but also includes the mothers of Michael Brown and Eric Garner, victims of high-profile police-involved killings. They have campaigned with Hillary Clinton, who often refers to them as members of “a club no one wants to be a part of.”

“I didn’t want this spotlight, but will I do everything I can to focus some of that light on a path out of this darkness,” said Fulton.

“We’re going to keep building a future where police officers and communities of color work together in mutual respect to keep children, like Jordan, safe. Because the majority of police officers are good people doing a good job,” said Lucia McBath, the mother of Jordan Davis.

Before the group spoke, a video played of the women talking to the Democratic presidential nominee about what they’re dealing with and going through.

“Eleven times, eleven times he said he couldn’t breathe,” Gwen Carr said in the video, referring to her son, Garner, losing his life after being put in an apparent chokehold by an NYPD officer.

The group of women have traveled the country to promote gun control and reforms to make police officers more accountable as Clinton and Democrats are giving gun control and efforts to curb police violence a starring role at their summer convention.

“They’re too easily accessible to everyone, even children. You can go out on the street and get a gun,” said Terrez McCleary of Philadelphia, who lost her 21-year-old daughter to gun violence in 2009 and was among a few hundred people held a rally against gun violence Tuesday in Philadelphia’s Logan Square.

“I think they need to pay more attention to the pain we go through when we lose our children and to us when we ask them to make the laws stricter,” she said.

Clinton has made gun safety one of the foundations of her presidential campaign, vowing to overcome the legendary resistance of gun-rights advocates and their GOP allies to push for expanded criminal background checks and a renewal of a ban on assault weapons.

Her search for a breakthrough comes as Donald Trump has repeatedly touted the benefits of access to firearms as a way to counter to acts of violence. The Republican nominee promoted a law-and-order message at his convention, where speakers routinely expressed solidarity with police officers and decried the recent slayings of officers in Dallas and Baton Rouge, Louisiana.

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Yet Democrats view the recent spate of mass shootings and police-involved killings as turning the tide in favor of new restrictions on firearms and a catalyst for criminal justice reform.

“This is the moment,” said New York City Council Speaker Melissa Mark-Viverito.

Indeed, Americans increasingly favor tougher gun laws by margins that have grown after the spate of recent mass shootings, according to a recent Associated Press-GfK poll. Almost two-thirds say they support stricter laws, with majorities favoring nationwide bans on the sale of semi-automatic assault weapons such as the AR-15 and on the sale of high-capacity magazines holding 10 or more bullets.

Both conventions have coincided with a wrenching period of violence and unrest, both in the United States and around the world. Last month, a gunman opened fire in a crowded gay dance club in Orlando, Florida, killing 49 people and injuring 53 more in the worst mass shooting in U.S. history.

Still, despite a spate of high-profile shootings in recent years, including the 2012 slaying of 20 first graders and six adults at a Connecticut school and the murder of 9 African-American church members at a Charleston church last year, Democrats have largely failed in their efforts to change federal gun laws.

In the recent AP-GfK poll, less than half of Americans said they believe gun laws will get tougher in the coming year. But advocates for gun control say the political landscape has changed dramatically since the 1990s, when then-President Bill Clinton blamed heavy losses in the 1994 mid-term elections in part to a public backlash against the ban on certain military-style weapons. That ban expired after 10 years and has not been renewed.

“It’s clearly not 1994 anymore,” said Mark Kelly, the husband of former Arizona Democratic Rep. Gabby Giffords, who was seriously wounded in a 2011 shooting in Tucson that left six people dead.

Sen. Chris Murphy, D-Conn., said the shifting landscape is the result of several factors: Shootings such as the Sandy Hook school massacre in 2012, renewed concerns over terrorism and high-profile killings of black men in several cities.

“For the first time, this is a winning issue in the general election,” Murphy said.

For more on Campaign 2016, click here.

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