Sen. Scott P. Brown, Massachusetts Republican, is running neck-and-neck in his re-election bid against presumed Democratic opponent Elizabeth Warren, a Harvard professor known as President Obama's top consumer-protection adviser. Mr. Brown is seeking to localize the race after winning his seat two years ago on a national wave of tea party sentiment. (Associated Press)

Sen. Scott P. Brown, Massachusetts Republican, is running neck-and-neck in his re-election bid against presumed Democratic opponent Elizabeth Warren, a Harvard professor known as President Obama's top consumer-protection adviser. Mr. Brown is seeking to localize the race after winning his seat two years ago on a national wave of tea party sentiment. (Associated Press)