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Robert Gibbs, who is quoted in the article posted is clueless about the nuances of the Income Tax Code. In the article, he states "A middle class family donates a dollar to charity, they get 15 cents off their income tax. Bill Gates donates a dollar to charity, he takes 35 cents off his taxes."

Deductions are already limited for people with high incomes, and the higher the income, the less the deduction is worth:

If the taxpayer's adjusted gross income is above a threshold (or "applicable amount"), then the total allowable itemized deductions is reduced by the lesser of 3% of the excess of adjusted gross income over $156,400; or 80% of the total itemized deductions otherwise allowable.

For example, if someone had an adjusted gross income of $10,000,000 and gave $1,000,000 to charity (and had no other deductions), his allowable deductions would be reduced to $704,692. In the current maximum tax bracket of 35%, he would save about $246,642 or roughly 25% of the original $1,000,000. As incomes rise higher, that percentage gets lower. Under Obama's proposal, those making over $250,000 would be limited to 28% maximum writeoff, and in the above scenario, the taxpayer would take $197,314 off his taxes, or about 20% of the original million donation.