Daryl Hannah is handcuffed and arrested during the Keystone XL Pipeline Protest at Lafayette Park in Washington on Wednesday. Leigh Vogel/Getty Images hide caption

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Leigh Vogel/Getty Images

President Obama announces support for building an oil pipeline from Oklahoma to Texas, Thursday in Cushing, Okla. Tom Pennington/Getty Images hide caption

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Tom Pennington/Getty Images

Demonstrators march with a replica of a pipeline during a protest to demand a stop to the Keystone XL tar sands oil pipeline outside the White House last November. Evan Vucci/AP hide caption

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Evan Vucci/AP

Just How Many Jobs Would The Keystone Pipeline Create?

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