LOUISVILLE, Ky. (AP) -- Democrat Alison Lundergan Grimes says Republican Sen. Mitch McConnell has some explaining to do to Kentucky voters for his wife's role as a board member of a group that spent $50 million to close coal-fired power plants.
Grimes says the matter raises serious questions but refused to say Thursday whether she thinks McConnell's wife, Elaine Chao, should resign from the Bloomberg Philanthropies board.
McConnell's campaign says it's President Barack Obama's policies that are ruining the coal sector, and says Grimes is an Obama supporter.
Coal policy is an overarching issue in Kentucky's Senate race between McConnell and Grimes.
Chao joined the board a year after Bloomberg Philanthropies announced the $50 million commitment to the Sierra Club for its "Beyond Coal" campaign. A trade group representing Kentucky's coal industry has defended McConnell.
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