Personally, I think momentum is a pile of crap in this election, an easy and vapid way for the media to discuss results and trends. As other diarists have pointed out, there doesn't seem to be any reason why results for a particular state wouldn't stay about the same regardless of when that state's election would be held. The only exceptions, perhaps, are some earlier states where Clinton benefited from better name recognition, extended voting periods, or not enough time to campaign.
If you look at results from week to week, starting January 1, 2008, Obama has increased his lead in the sums of all categories of delegates over Clinton -- every single week. Some times by a lot, sometimes by a little, but always (a) cutting into Clinton's lead and then eventually (b) increasing his lead.
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