G.O.P. May Retain Its Lead in Statehouses
By David M. Halbfinger
Republicans score upset victories in governor's races in Maryland, Massachusetts and Georgia; Democrats win in Illinois, Michigan, Pennsylvania and Wisconsin, throwing four populous potential roadblocks in way of Pres Bush's re-election, but fail to unseat his brother Jeb in Florida or Rick Perry, Bush's successor as governor of Texas; photo of Rod Blagojevich of Illinois; Republicans do well in Northeast, easily winning re-election in New York and Connecticut and picking up New Hampshire office that Jeanne Shaheen gave up in unsuccessful bid for Senate; Democrat Jim Hodges is ousted by Mark Sanford in South Carolina; little-known Republican Sonny Perdue stuns Georgia Gov Roy Barnes; Mitt Romney wins in Mass and Robert L Ehrlich Jr is first Republican governor of Maryland in 36 years; Republicans also win in Nebraska, Ohio, Colorado, Rhode Island, Nevada, Idaho, South Dakota and Arkansas and lead in Vermont; Democrats win in Republican strongholds Kansas, Arizona, New Mexico and Oklahoma, as well as in Maine and Iowa (M)