East Bay Rep. Pete Stark has launched a nasty mail piece accusing his challenger, Eric Swalwell, of allegedly accepting “pay to play” donations from area developers. But the attack comes just weeks after Stark called a major development association, begging for the maximum donation for his 2012 re-election campaign — while bragging he used to be a developer himself. And we have the voice mail tape. Now locked in the toughest race of his career, Stark, 81, a 20-term Democrat, won’t debate Swalwell, 31 — a fellow Democrat, Alameda County prosecutor and Dublin City Councilman who seeks to represent the...