David Hogg, Parkland Survivor and D.N.C. Vice Chair, Hopes to Unseat Democratic Incumbents

Less than three months after the young political activist David Hogg was elected as a vice chair of the Democratic National Committee, he is undertaking a new project that is sure to rankle some fellow Democrats: spending millions of dollars to oust Democratic members of Congress in primary elections next year.

Mr. Hogg, 25, who emerged on the political scene as an outspoken survivor of the 2018 school shooting in Parkland, Fla., said his party must squelch a pervasive “culture of seniority politics” that has allowed older and less effective lawmakers to continue to hold office at a moment of crisis.

And so he is planning through a separate organization where he serves as president, Leaders We Deserve, to intervene in primaries in solidly Democratic districts as part of a $20 million effort to elect younger leaders and to encourage a more combative posture against President Trump.

In an interview, Mr. Hogg said he understood that he would face blowback for his decision to serve simultaneously as a top official in the party — which is typically focused on electing Democrats over Republicans — and as a leader of an effort to oust current Democratic lawmakers.

“This is going to anger a lot of people,” Mr. Hogg said of his efforts, which he began to brief allies, some lawmakers and party officials on in recent days. He predicted “a smear campaign against me” that would aim to “destroy my reputation and try to force me to stop doing this.”

“People say they want change in the Democratic Party, but really they want change so long as it doesn’t potentially endanger their position of power,” he said. “That’s not actually wanting change. That’s selfishness.”