The race for Virginia’s sprawling 9th congressional district is so heated that both candidates are trolling for votes not just in Virginia–but also across the border, in Tennessee. Caught in the race of his career, 14-term Democrat Rick Boucher plans to duck into Kingsport, Tenn., to press the flesh of the 2,000 or so potential Virginia voters who work at the Eastman Chemical Co. plant there. His challenger, Virginia state House Majority Leader Morgan Griffith, is heading to the same plant on Friday. Both are responding to an invitation from the company. [Snip] Republicans are planning an all-out push to...