John Judis has a provocative web article about how the Pennsylvania primary exposed Barack Obama's potential weaknesses as a general election candidate. It's defnitely worth a read. However, I'd add a couple points to balance out the gloomy picture he paints. First, you can't automatically assume that any constituency that didn't support him in the primary also won't support him in the general election. John details how Obama's share of white upscale voters diminished, and he attributes this to the Wright controversy. Maybe, or maybe those voters -- especially the women -- just preferred Hillary Clinton, but would also prefer...