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Coal accounts for more than half of the nation’s electricity generation, and 21 states depend on it for more than half of their electricity compared with their use of gas, nuclear and renewable energy sources, according to a report last year in Electric Power Monthly.

The top coal-dependent states include eight 2012 battlegrounds or must-win states for Mr. Obama’s re-election campaign: Colorado, Indiana, Iowa, Michigan, Missouri, Ohio, New Mexico and Wisconsin.

In addition, Pennsylvania, a big coal-producing state and another key swing state, depends on coal for 48 percent of its electricity needs.

Rhetorical shift

As a former senator from Illinois, where coal accounts for 47 percent of the electricity supply, Mr. Obama has been a proponent of the coal industry and a strong supporter of clean-coal technologies.

Even as Mr. Obama has embraced the idea that burning fossil fuels threatens major climate change and has backed efforts to reduce global warming, he had not supported a ban on new coal development. Instead, he backed policies that discouraged the further use of inefficient facilities while encouraging plants to be retrofitted with coal-capture and sequestration technology.

In the first three years of his presidency, Mr. Obama consistently included coal whenever speaking about the need to harness all of America’s multiple energy resources. But as environmental regulations have ramped up against the coal industrythis year, the president has not mentioned coal in remarks or speeches.

In some cases, the shift is stark. In 2010, he touted the U.S. as the “Saudi Arabia of coal.” In mid-January, he altered the statement to say the country is the “Saudi Arabia of natural gas.” He also omitted the word “coal” from his State of the Union address for the first time this year.

Most recently, during a speech devoted to energy policy Thursday in New Hampshire, Mr. Obama advocated “an all-of-the-above strategy that develops every single source of American energy,” but he made no mention of coal.

The White House did not respond to an inquiry about whether the omission of coal and clean-coal technology in recent speeches marks a policy shift.

Green opposition

Coal industry leaders closely watching the election-year energy debate have suspicions about the silence and worry that Mr. Obama has dropped his support for cleaner coal in response to pressure from environmentalists who call the very idea of “clean coal” a myth.

For example, a 2007 Sierra Club study blamed emissions from coal-fired power plants for contributing to at least 24,000 premature deaths a year in the U.S. and accounting for 36 percent of overall releases of carbon dioxide.

“Clean coal is sort of like healthy cigarettes or limited nuclear war or fat free donuts. It’s one of the great oxymorons of our time,” author Jeff Goodall wrote in his book “Big Coal, the Dirty Secret Behind America’s Energy Future.”

In years past, Mr. Obama didn’t seem to share those beliefs. While in the Illinois legislature, he voted to use sales taxes to help reopen closed coal mines and create incentives to attract businesses that use coal. In 2001, he voted for legislation that provided $3.5 billion in loan guarantees to construct coal-fired power plants.

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