Longtime Georgia state Sen. Buddy Carter (R) has defeated Dr. Bob Johnson (R).
Kingston and Perdue used the lone opportunity ahead of next Tuesday to wage personal attacks.
Perdue leads Handel by 22 percent to 20 percent in the bitter Georgia GOP Senate primary.
Nunn leads reps by margins of one to four points.
Michelle Nunn (D) raised $3.45 million, besting both of her GOP Senate opponents combined.
Rep. Allyson Schwartz (D-Pa.), who's running for governor, hasn’t voted since April 4.
Some conservatives, including Senate hopefuls, rejected the popular bill.
A Republican lawmaker running for Senate in Georgia is calling for improvements to ObamaCare.