There's new evidence to support Democrats' claims that Rep. Harry Mitchell (D-Ariz.) is running a strong reelection campaign.

A new poll shows the two-term incumbent leading former Maricopa County Treasurer David Schweikert (R) — albeit by a single point.

Mitchell had 45 percent support to 44 percent for Schweikert, with 6 percent for Libertarian Nick Coons and 5 percent undecided, in an internal poll obtained by the Ballot Box. 

Harstad Strategic Research, a Colorado-based firm, conducted the survey of 509 likely voters Sept. 13-16. The firm's polling memo does not state the poll's margin of error.

An earlier National Research Inc. poll showed Mitchell trailing Schweikert 46 percent to 38 percent. 

Democratic strategists are pleased with the results of the survey in light of the aggressive TV ads that have been run in the district against Mitchell. 

The conservative-leaning 60 Plus Association and Americans for Prosperity both ran ads against Mitchell starting after the primary in August. 

The Democratic Congressional Campaign Committee had reserved $1.2 million worth of TV airtime in the Phoenix market, but has since scaled that back based on the strength of Mitchell and their other incumbents.

Democrats have released a plethora of internal polls recently to counter the narrative of a GOP wave election.