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Democrats are evenly split, while the vast majority of Republicans support the pipeline.
Insiders from both parties see benefits.
America's utilities must be upgraded, and it's the consumers, not the shareholders, who will get the bill.
The White House has a better chance of success if it focuses on preparing communities for extreme weather.
Republicans and other EPA critics say that carbon-emissions rules could threaten the flow of electricity.
Administrator Gina McCarthy said her focus remains on power-plant pollution.
Defying a veto threat, Republicans push through bill to limit EPA regulation of power plants.