House Republicans have surprising new company in attacking Nancy Pelosi: her fellow House Democrats. Three Democrats running in GOP-leaning House districts have used late-stage television ads in a bid to distance themselves from the liberal leader of Democrats' House caucus—the same caucus they're fighting to join in 2015. "Here's what I believe: Congress is broken," says Gwen Graham, one of the Democratic Party's top recruits, in a recent TV ad as a photo of Pelosi and House Speaker John Boehner flashes on the screen. "Both parties—Republican and Democrat—are to blame. And both need new leaders in Washington." In Georgia, Rep....