CORRECTIONS

· The Monday Fix column in the Oct. 13 A-section incorrectly reported that the National Republican Senatorial Committee was launching ads in Maine's U.S. Senate race. The NRSC purchased ad time in the Portland, Maine, media market, but that expenditure was intended for New Hampshire's Senate race.

· An Oct. 13 Style article on negative politics misstated the title of a book by David Mark. It is called "Going Dirty," not "Dirty Politics."