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Manchin: Dem Senate Majority 'Weighing Heavy' On Obamacare

AP Photo / J. Scott Applewhite

"It's going to be extremely challenging," Manchin said on CNN's "State of the Union."

He said that the success or failure of the health care law will be a major factor in the 2014 elections.

"It's weighing heavy on that," he said. "They think that that's a great advantage that they have," he added about Republican challanegers.

Manchin, a moderate Democrat, expressed skepticism about Obamacare's success so far, which has lead him to work on a delay of the individual mandate.

"Yes, we're moving the ball forward," he said, but added that he's concerned about how well the law has been received. "I'm worried about having a product that's a marketable buy."