Who died and made you Mark Bellhorn?

From SoSH

Frustration among Bellhorn supporters due to constant criticisms such as, "He strikes out too much" and "He should put the ball in play more" gave rise to the phrase, "Who died and made you Mark Bellhorn?"

Throughout Boston, people were once seen wearing "Who died and made you Mark Bellhorn?" shirts. There is also another once-popular shirt, "Don't blame me, I voted for Bellhorn."