At the OnTap blog, Cam Edwards passes along a Wall Street Journal report from the campaign trail in Pennsylvania on Friday that found Barack Obama digging himself a rhetorical hole on gun control, even in front of a hand-picked crowd. “If you’ve got a gun in your house, I’m not taking it,’’ Obama said. But the Illinois senator could still see skeptics in the crowd, particularly on the faces of several men at the back of the room. So he tried again. “Even if I want to take them away, I don’t have the votes in Congress,’’ he said. “This...