Hoekstra is now 14 points behind incumbent Sen. Debbie Stabenow in head-to-head polling, 51 percent to 37 percent. In July, her lead was just nine points, and in PPP’s previous three polls, her lead had been an average of seven points.

Stabenow’s approval ratings have changed little over the past six months. In fact, the change in poll numbers appear to be driven by disapproval of Hoekstra, whose favorability has dropped by a net ten points since PPP’s last poll.

In July, Hoekstra’s favorability rating was 31 percent favorable, compared to 30 percent unfavorable (+1). It now stands at 28 percent favorable and 38 percent unfavorable (-10).

The “Debbie Spend-It-Now” advertising campaign began on Super Bowl Sunday, and featured an Asian female with a conical hat riding a bike through a rice paddy field.