After embarrassing election in Pennsylvania, Republicans wonder whether tax cuts will save them in November
Marine veteran and former federal prosecutor Conor Lamb speaking at Democrats' nominating convention. Photo via the Pennsylvania Democratic Party.

WASHINGTON — The most dangerous outcome for Republicans in Tuesday's special House election is not the prospect of a Democrat taking over one of their seats. It was the shrugging off by voters of the party's biggest legislative achievement: the tax cut measure that Republicans hoped would be their major campaign message as they head toward a turbulent midterm election.