Former Foreign Secretary Boris Johnson increased his lead in the race to become Britain's next prime minister Tuesday in a Conservative Party vote that eliminated one of his rivals and enabled upstart candidate Rory Stewart to defy expectations by remaining in the contest. Johnson, a flamboyant former foreign secretary, won 126 of the 313 votes cast by Conservative lawmakers in their second-round of balloting. The vote left five contenders vying to be the Tory leader who will succeed Theresa May as prime minister.