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Why do Dems give so little?

In the Washington Post's article, Democrats Discovering Campaign Law's Cost, is this paragraph:

A report released yesterday by the Center for Responsive Politics, a watchdog group, found that, contrary to common perceptions, Republicans have a big advantage over Democrats in donations from small donors, while Democrats are king among only the biggest.

Here is the report.

Why? Is that because fewer Democrats give or they give less per person? If the latter, do Democrats feel they have less disposable income?

What's your answer?