Today’s Board of Supervisors was well attended, by citizens and media alike.   The main topic was the launching of an investigation of local ACORN voter registration activities last year.   Supervisors Bill Horn and Pam Slater-Price brought the item to the agenda, and during discussion it was discovered that on top of a nearly 1-in-6 error rate in registration cards turned in by ACORN, 76 actual cards were turned over to Secretary of State Debra Bowen nearly a year ago, with no resulting outcome or prosecution.