Change You Can Believe In, As Long As You're Using Someone Else's Money, And Not Your Own
The WSJ, Greg Mankiw and Tax Prof all reported on Joe Biden's tax returns (available here and summarized on Tax Prof). As Tax Prof (Paul Caron) points out: "Despite income ranging from $210,432 - $321,379 over the ten-year period from 1998 to 2007, the Bidens have given only $120 - $995 per year to charity, which amounts to 0.06% - 0.31% of their income (see chart below)."
Tax Prof points to IRS statistics showing that taxpayers with AGI over $200,000 make an average charitable contributions of $20,434, and taxpayers with AGI between $100,000 and $200,000 make average charitable contributions of $4,057. From 1998-2007, Biden's average AGI was $245,000 and his average annual charitable contribution was only $369 ($7 per week), see the comparison in the chart below.