Barack Obama

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National Governors Association (NGA) Chair Oklahoma Gov. Mary Fallin waits for the arrival of President Barack Obama to speak to members of the National Governors Association in the State Dining Room of the White House in Washington, Monday, Feb. 24, 2014. (AP Photo/Jacquelyn Martin)

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**FILE** Smoke rises from the Colstrip Steam Electric Station, a coal burning power plant in in Colstrip, Mont., on July 1, 2013. Colstrip is kind of plant called on by President Barack Obama's climate change plan to reduce carbon dioxide emissions. On Feb. 24, 2014, the U.S. Supreme Court will hear arguments on the unanimous federal appeals court ruling that upheld the Environmental Protection Agency's unprecedented regulations, aimed at reducing the greenhouse gases blamed for global warming. The case comes to the court amid Obama's increasing use of his executive authority to act on environmental and other matters when Congress doesn't, or won't. (Associated Press)

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Maryland Governor Martin O’Malley, front left, and New Hampshire Governor Maggie Hassan, front right, lead fellow Democratic governors as they walk from the White House in Washington, Friday, Feb. 21, 2014, to meet with the media following a meeting with President Barack Obama and Vice President Joe Biden. (AP Photo/Jacquelyn Martin)

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Maryland Gov. Martin O'Malley, right, and Illinois Gov. Pat Quinn walk outside the White House in Washington, Friday, Feb. 21, 2014, before their meeting with President Barack Obama. (AP Photo/Charles Dharapak)