Republican nominee and Chester County Board of Commissioners Chairman Ryan Costello is leading his Democratic opponent physician Manan Trivedi by 13% in a new internal poll.

The findings claim that Costello held about 49 percent of the 300 registered voters polled, while Trivedi received only 36 percent. Sixteen percent of the participants remain undecided.

PA-6 is a circuitous district which includes parts of Montgomery, Chester, Berks and Lebanon County. Its been considered a particularly competitive seat in the upcoming House races due to long-time Republican Rep. Jim Gerlach’s retirement. The Democratic Congressional Campaign Committee (DCCC) recently invested a large amount of its Congressional ad money in the race.

The same poll found that 54% of likely voters disapprove of President Obama’s performance and that 53% disapprove of the Affordable Care Act.

This survey was conducted by the Tarrance Group, a well-known Republican strategic firm, on behalf of the Costello campaign. Therefore, these results should be taken with a grain of salt as internal polls are generally less reliable than independent surveys.

The poll was taken from May 5th to 7th. The margin of error is plus or minus 5.8 percent.