As a result of efforts by activists in Massachusetts, the state’s investment tax credit for donations to non-profit community development corporations in low- and moderate-income neighborhoods, has been a big success:  https://www.bostonglobe.com/business/2015/04/15/state-officials-call-new-charitable-giving-tax-credit-program-success/SPXzqiVTYHxewPVWaXUwoJ/story.html#