The oft–repeated refrain from gun control advocates after mass shootings is that gun rights groups used political donations in order to influence lawmakers to oppose gun control measures.

But it’s a little more complicated than that. Instead, say those who monitor the NRA and other gun rights groups, the goal is to make sure that the seats are never held by anyone who might support new restrictions in the first place.

Matt Grossmann, director of the Institute for Public Policy and Social Research at Michigan State University, said “it’s mostly hyperbole that campaign contributions can directly buy votes in Congress.”

Instead, he said, the issue falls on strictly ideological grounds: Republicans rarely stray from the party’s stance of opposing new gun restrictions while Democrats — once far more divided on the issue – have dug in on the notion of additional restrictions.

“The debate is on clear party and ideological lines,” he said.

And while Democrats have become more vocal on the issue, it’s episodic. No one is shutting down the government over gun control.

“It’s not like it’s the number one issue in the Democratic Party,” he said.

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While money may not change hearts and minds, it does, however, help win seats. According to the Center for Responsive Politics, an organization that tracks money in politics, gun rights groups spent some $54 million in outside spending on the 2016 elections. Gun control groups, by contrast, spent about $3 million.

Adam Winkler, a law professor at the University of California Los Angeles and the author of the book “Gunfight: The Battle over the Right to Bear Arms in America,” said while “money helps,” it’s how that money is spent that matters.

“The NRA is strong today not simply because it doles out independent expenditures,” he said. “The NRA is strong today because voters listen to the NRA.”

He also dismisses the frequent notion that pro–gun rights lawmakers vote that way solely because of campaign contributions.

“If you think elected officials are for sale to the highest bidder, then Michael Bloomberg (who founded Everytown for Gun Safety, a gun control group) should just spend more than the NRA does on the exact same candidates,” he said. “I would assure you that all the Republican candidates who got a huge contribution from Michael Bloomberg are not going to change their positions on guns…the NRA’s power comes from the fact that they can swing voters on Election Day and politicians know that.”

While polls taken as late as November 2017 indicate that 94 percent of Americans support requiring background checks for all gun buyers, for example, Winkler said, the gun rights advocates often have more power because they are more vocal.

“In a democracy, a mobilized and vocal minority can often win over a diffuse majority,” he said. “And that’s how it is on gun control. A lot of people support federal gun control laws but are not single issue pro-gun control voters, whereas people are often single-issue pro-gun voters.”

Asked about NRA contributions to her boss, Portman spokeswoman Emily Benavides said Portman supports Second Amendment rights but believes in strengthening the national background check system and working to keep guns out of the hands of criminals.

“Rob’s priority is doing what’s right for the people of the Ohio and that’s what guides his legislative decisions in Washington,” she said.

She called the most recent mass shooting at a Florida high school — which killed at least 17 — “an unspeakable tragedy.”

“Senator Portman and his wife, Jane, send their prayers to the victims, their families, and the entire school community,” she said.

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