Hillary Rodham Clinton will seek out donors to her presidential campaign from a Democratic fund-raising landscape vastly altered since her first presidential bid and far more ideologically aligned with the party’s liberal activists.

Democrats now get far less money from Wall Street, military contractors, health care companies and other industries that for decades ladled out cash more evenly to both parties, according to a New York Times analysis of data collected by the Center for Responsive Politics, a watchdog group. And the party now relies far more on constituencies that have achieved new clout in the era of “super PACs” and carefully targeted digital fund-raising.

As many as one-fifth of elite Democratic “bundlers” — volunteers who raise money from friends and business associates — are active in gay-rights causes or are themselves gay or lesbian. Outside Democratic groups rely heavily on wealthy environmentalists, such as the billionaires Tom Steyer and Michael R. Bloomberg, and on labor unions, whose financial might has been magnified by the Supreme Court’s Citizens United decision in 2010 even as their membership rolls decline.

Female donors and bundlers have become both a bigger source of funding and a more organized financial force in party affairs: Emily’s List, a political group dedicated to electing female Democrats, now has five times as many members and twice as many donors as it did when Mrs. Clinton ran for president in 2008. And Democrats now rely far more on grass-roots donors to be financially competitive with Republicans. Democratic Party committees raised $200 million from donors giving $200 or less in 2014, according to Federal Election Commission records, twice as much as in 2008.