'We are the table': Meet the history-making women controlling the most powerful levers of U.S. government

More than 25 years after Susan Collins arrived in the U.S. Senate, she -- along with Democratic Sen. Patty Murray of Washington state, Republican Rep. Kay Granger of Texas and Democratic Rep. Rosa DeLauro of Connecticut -- will hold the top spots on the Senate and House Appropriations committees, an influential crew on Capitol Hill commonly known as the 'Four Corners.'