Updated 10:05 p.m. | Rep. David Schweikert led fellow Republican Rep. Ben Quayle by 16 points in a recent Schweikert campaign internal poll.

The two Congressmen are engaged in a blockbuster Member-vs.-Member race for Arizona’s 6th district that has caught the attention of state Republicans. According to the survey from this past Sunday, 49 percent of respondents supported Schweikert, while 33 percent said they intended to vote for Quayle.

There had been rumblings in Arizona political circles of an internal campaign poll showing a wide Schweikert lead for several days.

The poll, conducted by Adam Geller of National Research Inc., was conducted July 22 and was a live telephone survey. It included 300 “likely GOP primary voters” and had a margin of error of 5.66 points.

Whoever wins this race will likely have a lock on the district for years to come. Roll Call rates this race as Safe Republican.

Updated 10:05 p.m.

A source in the Quayle camp said that it is a close race and Schweikert is “not ahead.”