synaptic and sudo help please[SOLVED]

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http://crunchbanglinux.org – So I go to run synaptic as usual and a message box pops up:Failed to run synaptic as user root. The underlying authorization mechanism (sudo) does not allow you to run this program. Contact the system administrator.I tried in a terminal and I get a scary message from Big Brother:damo is not in the sudoers file. This incident will be reported.I tried logging in as root, so I could edit sudoers, but the root password wasn't recognised (assuming I remembered it properly!)Recent activity included adding myself to lpadmin so I could set a printer as default, and I did sudo visudo to look at (HowTos)