CNN

Rep. Henry Waxman successfully toppled Rep. John Dingell for a key chairmanship.

WASHINGTON (CNN) - Congressional Democrats have a bigger majority than they've enjoyed in decades, but that doesn't necessarily mean there will be unity on Capitol Hill.

A new battle may be brewing as Democrats fighting Democrats show evidence of a party divide.

The growing Democratic majority could be in deadlock from within on issues ranging from climate change and energy to health care and social security.

"We're not just talking ideology here. The broader your majority, the more you've got different regions of the country that have different economic and social interests that you have to take into account," said Norman Ornstein, a scholar with the American Enterprise Institute.

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