With Conservative Party candidate Doug Hoffman running neck and neck with the Democrat in Tuesday’s special election in New York, some other disaffected Republicans are seeing the third-party route as more viable. And it could hurt the Republicans in those races. In Virginia’s 5th district, state Sen. Robert Hurt’s entry into the GOP primary has spurred little-known candidate Bradley Rees to switch to the Virginia Conservative Party. And in Ohio, another GOP primary contender said this week that he’ll run as a Constitution Party candidate. Both will go at the GOP nominees from their right flanks and try to expose...