This YouTube video shows Rehberg, who is challenging Democratic Senator John Tester in Montana, walking away from the tracker and ducking in a building, but not before apparently giving him the "one finger salute."
From BuzzFeed:
Rehberg spokesman Chris Bond, says the DSCC is ginning up controversy:
"This is ridiculous, and Denny is clearly scratching his head, but it just goes to show how far Senator Tester's liberal Washington allies will go to try and manufacture a negative story in order to cover up for Tester's record of 95% support for President Obama's failed agenda."

