Bloomberg’s Gun Control Group Pours $15 Million Into Races in 8 States

The organization’s focus on digital advertising comes during what its top political aides said was the fastest change in media consumption habits since the dawn of the digital age. With millions of Americans homebound because of the pandemic, nearly half of all television consumption is now on streaming platforms.

“2020 looks more like 2025,” said Charlie Kelly, a senior Everytown political adviser.

Mr. Kelly estimated that the cost to reach voters on digital platforms across enough competitive state legislative districts to flip a state chamber was a fraction of the resources required in a federal or statewide race. Mr. Kelly said Everytown would spend to help Mr. Biden in Florida, but not elsewhere, after consultation with other Democratic super PACs, like Priorities USA, that would take responsibility for different states.

“The goal is to win and everybody comes to the table to do that,” Mr. Kelly said. “Post-2016, people were like, ‘We got to get ourselves together on that front.’”

Everytown is just one element of Mr. Bloomberg’s political largess. He spent nearly $1 billion on his own presidential campaign, which ended after he won the Guam caucuses but no states. Mr. Bloomberg had pledged to pay his staff members through November, but later abandoned those plans and donated the $18 million remaining in his campaign account to the Democratic National Committee.

Field staff members for his campaign subsequently filed class-action lawsuits arguing they had been tricked into accepting jobs.

Mr. Bloomberg’s personal super PAC, Independence USA, spent about $60 million on 2018 races but has yet to engage in 2020 contests.

Everytown’s success has come as the National Rifle Association’s financial muscle has atrophied. The 2018 midterm elections were the first time gun control organizations — Mr. Bloomberg’s Everytown and a group founded by former Representative Gabrielle Giffords of Arizona — had outspent the N.R.A. in federal elections.