A diary I came across by Emporer hadrin on Daily Kos, presents an interesting theory. I personally think this is true. It makes sense if you look at the polling, and this is going to pose a problem over time. Neither supporters are going to leave their candidate to support the other. But, somehow this needs to be resolved so Hillary can be defeated.
A few days ago, I was on MyDD.com reading some diaries. One of the diaries was regarding the democratic primary polling. The diary was a tirade about how horrible it is that Hillary is still beating Obama and Edwards by a large margin. The person who posted the diary took particular anger to the fact that polling is showing that combining the support of Obama and Edwards yeilds a margin similar to Hillary's overall support. I want to offer a theory as to why this is the case. The fact that I am leaning towards Hillary (experience matters more to me than a vote) doesn't prevent me from seeing things objectively. I think the presence of both Obama and Edwards increases the chances that Hillary will be nominated. I think that Obama and Edwards are splitting the anti-Hillary vote, which would just go to one if the other wasn't running.
* EmperorHadrian's diary :: ::
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One bit of evidence for this theory can be found in some polling I have seen. One poll (I think Gallup) found that democratic voters who supported Hillary did so because of positive pro-Hillary factors. Examples would be her experience and her proven judgment (one vote doesn't invalidate 30 years of judgments). On the other hand, support for Obama (I didn't see an analysis of support for Edwards, although my guess is the case is the same for him) was more dependent on anti-Hillary feelings. Examples would be "she can't win" or her support initial support for the Iraq invasion. To be sure, a good sized chunk of Obama support was due to pro-Obama feelings, but that support was still heavily dependent on anti-Hillary support.
Given the fact that neither Obama or Edwards are known that well (not as much as Hillary especially), it seems to me that their support is more dependent on vague notions about the candidates, and the heavy knowledge of Hillarys pluses and minuses. So I think that it is the fact that both are running, which is making it so that neither may end up being nominated. Just look at Daily Kos. I just saw a primary poll, where most Kos support was split between Obama and Edwards. If either Obama or Edwards weren't running, how much of that would go to Biden? How much to Hillary? Probably not much. I would also bet that most Obama supporters would be much more reluctant to support Hillary than Edwards, and most Edwards supporters would be much more reluctant to support Hillary than Obama.
http://www.dailykos.com/storyonly/2007/5/15/221027/240