Dan Balz @danbalz
A career for the ages. Mark analyzed politics with smarts and humor, flashes of indignation and most of all a very big heart. He believed in politics as sometimes noble but always vital. He respected those who entered the arena but held them to high standards. What a run! — PolitiTweet.org
PBS NewsHour @NewsHour
WATCH: We look back at the best moments we've had with our friend Mark Shields https://t.co/L8BQaE2p9y https://t.co/DqR34BIGGu