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As I said, Obama was running well ahead of Clinton in head-to-head matchups a few weeks ago, and now they're tied. After several more weeks of Clinton reinforcing McCain's message against Obama, Clinton will probably be performing better than Obama against McCain. This is the point I made in my TRB column. She needs to convince the remaining uncommitted superdelegates to split for her by about a 2-to-1 margin. The only way she can get a split like that is if she can persuasively argue that Obama is unelectable. And the only way she can do that is to make him unelectable. Some people have treated this as an unfortunate byproduct of Clinton's decision to continue her campaign. It's actually a central element of the strategy. Penn is already saying he's unelectable. It's not true, but by the time the convention rolls around, it may well be.