Another Pulitzer-winning cartoonist has been shown the door. Steve Benson was laid off Wednesday by his longtime employer, the Arizona Republic, as part of larger cuts by the Gannett company. He had been at the paper nearly four decades, winning the Pulitzer in 1993 and being named a finalist for the prize four times. The layoff represents the latest spasm of shrinking among staff editorial cartoonists — who numbered in the hundreds several decades ago, but now have dwindled to dozens.