Joni Ernst is on the rise. Less than a week after her primary victory, a third poll shows the Republican Senate candidate leading Democratic congressman Bruce Braley.

A new Vox Populi survey showed nearly half of Iowan voters backing the relatively unknown state senator. According to the poll, Ernst leads 49 percent to 44 percent.

Last week, two polls found Ernst up over Braley, including a Loras College poll that had ahead by 6 percentage points. A Rasmussen poll gave her a 1 percentage point lead.

All three surveys are a significant reversal of the polling prior to Tuesday’s primary. The most recent poll taken before the primary showed Braley with a six-point lead over Ernst. Braley has stumbled in recent months, most notably by referring to Iowa’s Republican senator Chuck Grassley as a “farmer from Iowa who never went to law school” at a fundraising event in Texas.

Ernst and Braley are running to replace retiring Democrat Tom Harkin, and many political observers had expected that the seat would stay in Democratic hands.