Gwen Ifill, a groundbreaking journalist who covered the White House, Congress and national campaigns during three decades for The Washington Post, The New York Times, NBC and, most prominently, PBS, died on Monday at a hospice in Washington. She was 61.

The cause was complications of uterine cancer, her brother Roberto said.

In a distinguished career, Ms. Ifill was in the forefront of a journalism vanguard as a black woman in a field dominated by white men.

She achieved her highest visibility most recently, as the moderator and managing editor of the public affairs program “Washington Week” on PBS and the co-anchor and co-managing editor, with Judy Woodruff, of “NewsHour,” competing with the major broadcast and cable networks for the nightly news viewership. They were the first all-female anchor team on network nightly news.

Last spring, she and Ms. Woodruff were the moderators of a Democratic primary debate between former Secretary of State Hillary Clinton and Senator Bernie Sanders, reprising a role that Ms. Ifill had performed solo between sparring vice-presidential candidates in the 2004 and 2008 general election campaigns.