PENNSYLVANIA RACE IS VIEWED AS CLOSE
Joseph Timilty, Penna coordinator for Carter, is trying to keep state faction-ridden Dem Party from exploding and costing Carter state; learns that Mayor Frank L Rizzo planned not to attend downtown rally because Carter staff had also invited some of leaders of abortive recall drive against Rizzo; Rizzo is finally persuaded to meet Carter aboard his chartered plan and ex-Sen Joseph S Clark, recall leader, is persuaded to stay away; efforts of Rizzo and organized labor will play major role in determining whether Carter vote reaches polls; reasons for difficulty of Carter campaign in Penna discussed (M)
