Dark money group Americans for Tax Reform just dropped close to $2 million to influence competitive House races. 

Victories for the 501(c)4 non-profit lobbying organization, founded by conservative lobbyist Grover Norquist in 1985, would undoubtedly complicate efforts to reach a deal to avert the so-called "fiscal cliff" because the group "opposes all tax increases as a matter of principle." ATR's central tenet -- the Taxpayer Protection Pledge, which requires lawmakers to  "solemnly bind themselves to oppose any and all tax increases," enjoys the backing most Republicans in Congress and all but one of this year's GOP presidential ...