Are small campaign donors making a difference?
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![Democratic presidential hopeful Barack Obama](https://img.apmcdn.org/34357acfdbc5c0c4f291337a2375ea8b1417e95c/uncropped/4c68d4-20080507-obama.jpg)
Democratic presidential hopeful Barack Obama's fundraising machine has been fueled in part by small contributions from online donors.
Photo by Mark Wilson/Getty Images
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