Richard Cohen writes a weekly political column that appears on Tuesdays. He also contributes to the PostPartisan blog. Cohen joined The Post in 1968 as a reporter and covered night police, city hall, education, state government and national politics. As the paper’s chief Maryland correspondent, he was one of two reporters who broke the story of the investigation of former Vice President Agnew. In 1976, he began writing a column that ran on the front of the Metro section. His columns have appeared on the op-ed page of The Post since 1984. He is the author, with Jules Witcover, of “A Heartbeat Away: The Investigation and Resignation of Spiro T. Agnew ” (1974). He has received the Sigma Delta Chi and Washington-Baltimore Newspaper Guild Awards for his investigative reporting.