At What Point Does the Secret Service Shut This Down?

Daily calls for Obama's assassination at Palin events is dangerous.

If the candidate and her surrogates won't stop it, I personally believe the secret service has an obligation to shut these events down -- at least as long as it takes to arrest the knuckleheads who are inciting to violence.

Talking Points Memo | Palin Supporter On Obama: "Kill Him"

UPDATE: This is the right signal to send to these crazies: The Secret Service is on the case.