It's hard to believe that if you throw out Gore and the Irish guy (O'bama), there are 49% would would vote for Kerry and Edwards combined. Must be a whoooooole lotta "don't know"s.
There were a bunch of other potential candidates in the poll besides Kerry and Edwards (Bayh, Dodd, Richardson, Vilsack, Clark, etc.), but the article doesn't show the totals with Gore and Obama removed. According to the poll, 36% of Democrats don't think Hillary can win a general election, so that's probably a big reason why so many Democrats are looking for an alternative.