Here is your “whoa” poll result of the day:

South Dakota Rep. Stephanie Herseth Sandlin has a race on her hands. A new poll shows the Blue Dog leader down 12 points to state Rep. Kristi Noem, who defeated two legitimate opponents to win the Republican nomination Tuesday. Noem leads 53 percent to 41 percent in today’s Rasmussen poll. Previous polls by Rasmussen showed Noem down 15 points in April and 3 points in May.

Post-primary bounce? Sure. But that’s a heck of a bounce.