Now that Republican presidential nominee Mitt Romney has released his 2011 tax returns, it's possible to compare charitable giving between the candidates.
Below is a clear breakdown of income, tax rates and charitable giving in 2011 between Romney; his running mate, Paul Ryan; President Barack Obama and Vice President Joe Biden.
Tax rates and charitable giving in 2011
President Barack Obama:
Income: $790,000
Federal taxes: $162,000
Tax rate: 20.5 percent
Charitable donations: $172,000
Percentage of income: 22 percent
Republican presidential nominee Mitt Romney:
Income: $13.7 million
Federal taxes: $1.94 million
Tax rate: 14.1 percent
Charitable donations: $4 million
Percentage of income: 29.35 percent
Vice President Joe Biden:
Income: $379,178
Federal taxes: $87,900
Tax rate: 23 percent
Charitable donations: $5,500
Percentage of income: 1.46 percent
Vice presidential nominee Paul Ryan:
Income: $323,416
Federal taxes: $64,764
Tax rate: 20 percent
Charitable donations: $12,991
Percentage of income: 4 percent
Comparisons:
2011 income 
2011 tax rate
Percent of income donated to charity