Which Democratic candidate is most electable? Hillary, Obama or Edwards?

This poll says it's Obama.

In a hypothetical matchup against Obama, the weakest of the five leading Republican candidates are Romney (minus 18 percentage points) and Thompson (minus 16 percentage points.

The strongest GOPers against Obama are McCain (minus four percentage points) and Huckabee (minus five percentage points).

Against Hillary, three Republicans -- McCain, Giuliani and Huckabee -- are leading by small margins.

Against Edwards, Giuliani and McCain are leading, but only by smidgens.