According to a new Gallup poll, just over a quarter (28%) of Clinton supporters say they will vote for McCain rather than Obama if she doesn’t win. By contrast, just 19% of Obama supporters say they will support McCain. As with any poll, especially one taken so far ahead of the event it relates to, this must be taken with a large dose of salt, but it’s educational nonetheless.

Allahpundit over on Hot Air suggests that this is a measure of “sore-loserness” but I think that misses the point. The point is that there are at least two reasons why someone willing to vote for Clinton would be more likely to switch to McCain than someone who wanted Obama. The first is that, for those few people who can accurately place all three candidates on a traditional left-right spectrum, Hillary is closer to McCain than the comparably more left-wing Obama.

The second, though, and one more likely to be at play here, is that those favoring a serious candidate will prefer both Clinton and McCain over the less substantive Obama. While Clinton has of late taken to embellishing her own credentials she has overall focused far more on specifics and has a greater record on which to draw than does Obama. It’s likely that voters favoring experience and substance shy away from Obama and prefer Clinton to McCain by a greater or lesser margin.

Allahpundit goes on from his initial premise that this is about Hillary supporters being sorer losers to suggest that they key to keeping these numbers high is to make those supporters as sore as possible. But I think the correct strategy would actually be to continue to highlight Obama’s lack of substance, which is behind at least some Democrats’ distrust of him.