An internal poll of the Georgia Senate Republican primary runoff conducted for Rep. Jack Kingston found him with a double-digit lead over his opponent, businessman David Perdue.  

Perdue got more votes than Kingston in the crowded Republican primary last month, but Kingston appears to have the momentum now that voters have to choose between just the two of them. They will face off on July 22.  

According to the poll, Kingston led Perdue, 49 percent to 35 percent, with 16 percent of voters undecided. That result is close to the SurveyUSA automated poll released last week that found Kingston ahead, 52 percent to 41 percent.  

The internal poll was conducted for the Kingston campaign by Republican polling firm McLaughlin & Associates. It surveyed 500 likely runoff voters from May 27-29, using live telephone interviewers to both land line and cellphone users. It had a 4.5-point margin of error.  

Perdue and Kingston are vying for the open seat being vacated by Sen. Saxby Chambliss, R-Ga. The two got the most votes in the primary last month, but neither topped the 50 percent threshold necessary to avoid a runoff. The winner will face Democrat Michelle Nunn in November.  

The race is rated Favored Republican by the Rothenberg Political Report/Roll Call.