Colorado telephones are ringing again on Thursday with a robocall from the McCain campaign tying Barack Obama to "domestic terrorist Bill Ayers," whose group "killed Americans." The robocall, labeled "the worst one yet" by TPM's Greg Sargent
, continues a McCain tactic of decrying personal attacks in public while carrying them out under the radar. It's the second attack robocall questioning Obama's patriotism
reported in Colorado in as many days.