According to a National Journal "insiders" poll, most Republicans want Dick Cheney to shut up (h/t Americablog):
Q: Has Dick Cheney helped or hurt the Republican Party since leaving office?
Republicans (100 votes)
Helped: 33 percent
Hurt: 57 percent
Of course these insiders don't have the guts to publicly say this, so the title could be, 2 out of 3 Republican insiders are cowards.