From left, in the WTOP newsroom last spring: Mark Plotkin, J.J. Green, Judy Taub and Neal Augenstein. (Astrid Riecken for The Washington Post)

Plotkin was formerly the host of WTOP’s “The Politics Program,” broadcast Friday mornings. According to a staff e-mail at WTOP, the weekly show has been canceled.

Plotkin was outspoken in his support of D.C. voting rights. He dissected Mayor Vincent Gray’s remarks about the District’s treatment by the federal government at the Martin Luther King Jr. memorial dedication.

Plotkin alluded to “corporate pressure” at WTOP in November, when he joined Twitter.

View Photo Gallery: Take a look inside the “glass-enclosed nerve center” of WTOP, Washington’s most popular and lucrative radio station.