I think the political environment in Pennsylvania has dramatically changed since last year, and now the Republicans are looking increasingly competitive," said Terry Madonna, a political scientist and pollster at Franklin & Marshall College In Lancaster, Pa. Obama was the fifth consecutive Democratic presidential candidate to carry Pennsylvania, and winning the 21 electoral votes from the Keystone State helped him clinch the presidency. But just below the national political radar, Pennsylvania last month held statewide judicial races in which six of the seven contests on the ballot were won by Republicans. Sen. Arlen Specter, a Democrat who switched parties earlier...