Tomorrow is the most important day yet in Hillary Clinton’s presidential campaign. The likeliest outcome is that she will win Indiana and hold Barack Obama to a single-digit margin of victory in North Carolina, which will provide her with a very strong argument for continuing her candidacy and taking the nomination away from a stunned Obama. Whether she convinces the superdelegates to vote for her in large enough numbers or the media to change its narrative is another matter. Of course, if she somehow wins North Carolina then it becomes a tough argument for the superdelegates or the media to ignore. It might even be enough to make her the frontrunner again. And if Hillary somehow loses Indiana, she’s finished. But as I say, the first ambiguously pro-Hillary result is still the likeliest outcome.