WBBM-AM 780's Bob Roberts and I question Metra Chair Carole Doris on "At Issue," which airs at 9:30 a.m. and 9:30 p.m. Sunday. Doris has been the embattled agency's public face since former executive director Philip Pagano killed himself May 7, following disclosures of his financial wrongdoing. Doris responds to a Sun-Times and Better Government Association investigation on Metra pay, and other issues.