Why do Democrats claim they're more generous than Republicans?

[Elle]

It's a fact that Republicans give a higher percentage of their income to charity, so how can Democrats claim they're more generous?
Right, democrats are always ready to give away other people's money. How generous is that?
I thought this was common knowledge... anyway, for the skeptics...A quick google search will yield tons of articles. This is just the first: http://philanthropy.com/free/articles/v19/i04/04001101.htm