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I thought to measure momentum you needed two points on a line...or maybe 10 or twelve.
Everytime Clinton had a single good night, she "got momentum" and her supporters get all fired up that maybe she has a chance after all. And then she loses delegates for awhile. And then a few weeks later, she gets "momentum" again. Obama gets delegates almost every day for the last 2 months and that forward motion (momentum) doesn't count for some reason.
I'm cool with giving florida the delegates according to the split (although it might not go that way now...some polls suggest if the elections were held today, Obama would win New Jersey and come close or take california). Michigan is different and probably screwed. 50/50 would be most fair though the compromise rejected by Clinton's folks was most generous. In any case it's worth narrowing the lead to take away one of the arguments.
As for "she hasn't lost yet". Perhaps if I see Spock with a beard I'll know I slipped into an alternate universe where command changes occur suddenly and at the point of a knife. Until then I'm kind of math based and it looks like she "will lose" (if you like that better than "lost")