Candidates in three of the races that could determine control of the Senate engaged in bitter and personal attacks.

© Pool photo by Paul Sancya

Candidates in three of the races that could determine control of the Senate engaged in bitter and personal attacks.

© Pool photo by Paul Sancya

Senator Jon Ossoff, a Democrat, called his Republican opponent, Representative Mike Collins, a bigot. Mr. Collins called the incumbent a radical “trust-fund kid.”