The race between President Barack Obama and Republican presidential candidate Mitt Romney "remains neck and neck," according to an AP-GfK poll released Wednesday -- the outlets' first since Paul Ryan was added to the ticket.

The poll showed 47 percent of registered voters supported Obama/Biden compared to 46 percent for Romney/Ryan. In AP-GfK's last poll, taken in June, 47 percent of voters supported Obama, and 44 percent supported Romney.

The AP-GfK results support other recent polls that have found little has changed since Paul Ryan became Romney's running mate.

The survey showed that a large percentage of voters expect Obama to win -- 58 percent of adults said they thought Obama will be re-elected compared to 32 percent who said they thought he'd lose the election.

The AP-GfK poll was conducted using live interviews of 1,006 adults, including 885 registered voters, between Aug. 16 and Aug. 20. It had an overall 3.9 percent margin of error and a 4.1 percent margin of error among registered voters.

Also on HuffPost:

Loading Slideshow...
  • South Carolina Gov. Nikki Haley

    (Photo by Rainier Ehrhardt/Getty Images for NASCAR)

  • Former Arkansas Gov. Mike Huckabee

    (Photo by Chip Somodevilla/Getty Images)

  • Ohio Gov. John Kasich

    (Photo by J.D. Pooley/Getty Images)

  • New Mexico Gov. Susana Martinez

    (FREDERIC J. BROWN/AFP/Getty Images)

  • Sen. John McCain (R-Ariz.)

    (Photo by Alex Wong/Getty Images)

  • Former Secretary Of State Condoleezza Rice

    (YURI CORTEZ/AFP/Getty Images)

  • Florida Gov. Rick Scott

    (Photo by Joe Raedle/Getty Images)