The "Eric Cantor" sandwich was unveiled January 23 at Stacks, Washington's new kosher deli, at a fundraiser for the newly appointed deputy House majority whip. The sandwich chosen to carry the name of the only Jewish Republican in the House of Representatives was a tuna-based stacker — not quite a power lunch befitting the person who GOP leaders hope will reinforce the growing trend of Jews switching their partisan loyalty from Democratic to Republican. That may explain why Cantor asked Stacks to switch his eponymous sandwich from tuna to roast beef on challah, a deli special that exudes Jewish power....