It's happened so often that it's now a cultural cliche: the gay politician pretending to be straight. In most parts of the nation, homosexuality or bisexuality is a clear electoral liability. Not in Center City's 182d state House district. There, it's a badge of honor. Veteran Rep. Babette Josephs (D., Phila.) last Thursday accused her primary opponent, Gregg Kravitz, of pretending to be bisexual in order to pander to lesbian, gay, bisexual, and transgender voters, a powerful bloc in the district. "I outed him as a straight person," Josephs said during a fund-raiser at the Black Sheep Pub & Restaurant,...