Republican U.S. Sen. Scott Brown and his Democratic challenger Elizabeth Warren fought over who would be better at creating jobs, protecting Medicare and keeping down the cost of higher education during their third debate Wednesday night in Springfield.  Warren faulted Brown for voting against a series of Democratic-sponsored jobs bills. She said Brown would repeal the federal Affordable Care Act.  Brown said he opposed the jobs bills because they would have hiked taxes. He said he opposes what he called ``Obamacare'' because it also includes tax increases.  The two also sparred on higher education.  Brown faulted Warren for her salary as a Harvard Law School professor, which he said adds to the cost of education.  Warren said she went to a public college and said the country needs to reinvest in education to help other students get a toehold in the economy.  (Associated Press)