NEW : Rules of debate should change , not change , they say . Democrat Romney , Republican Coburn want to encourage civil discourse . Romney says the the move may help tone down the rhetoric . `` I do n't plan to debate my values and the principles of my constituents any less vigorously , '' she said on the CBS program . ` Coburn says question ideology , not motives , of political foes .
NEW : Rules of debate should change , not change , they say . Democrat Romney , Republican Coburn want to encourage civil discourse . Romney says the the move may help tone down the rhetoric . Coburn says question ideology , not motives , of political foes .