Greenwire: An effort by environmental activists to question Illinois Sen. Mark Kirk's (R) green credentials has the campaign arm for Senate Republicans seeing red -- and demanding that the IRS revoke the Natural Resources Defense Council's tax-exempt status.
In a complaint filed to the IRS last week, the National Republican Senatorial Committee accuses NRDC of a "flagrant violation" of its tax status as a 501(c)3 organization, pointing to an ad campaign the nonprofit launched earlier this month.
"NRDC...