According to Deadspin (take it with a grain of salt though), Jay Mariotti quit his Sun-Times job because of a perceived slight? Word is he wanted to write a column about Barack Obama after he returned from coming the Summer Olympics in China, but the Sun-Times' editors nixed the idea and gave the gig to Rick Telander.
Mariotti returned to the Sun-Times building to tape his Around the Horn segment, but management deactived his pass while management was deciding whether or not they should accept his resignation.
And now this from Sun-Times editor Michael Cooke:
"We wish Jay well and will miss him — not personally, of course, but in the sense of noticing he is no longer here, at least for a few days."