Voters hoping to size up the candidates in one of the nation’s marquee Senate races with a series of high-profile debates may be disappointed. Though Senator Scott Brown, a Republican, and Democrat Elizabeth Warren on Tuesday agreed to their first two primetime television debates, they are at loggerheads over the rest of the schedule, a sign of increasing acrimony in a race that could help determine control of the Senate.

Brown has said he wants three or four debates, but two of those would be low-profile radio appearances he has accepted. Added to those will be the two primetime television debates - one on WBZ-TV (Channel 4) with Jon Keller, and another sponsored by a consortium of Springfield media outlets.