Former Mercer County Clerk Catherine DiCostanzo resigned this week from the Mercer County Tax Board, leaving her with just one paying government job instead of two. After narrowly losing re-election in 2004, she became the Mercer County Superintendent of Elections. But DiCostanzo didn’t resign because she opposed double-dipping; indeed, she left because after two years of trying, she has reportedly failed her certification test and required classes and the state would have mandated her dismissal after June 30.