The red truck was on the should and partly on the grass. It looks like the white truck was in the right lane and governor in the left. The red truck veers back onto the road and back into the near lane which is occupied by the white truck. The white truck veers left to avoid being hit by the red truck. The white truck clips the governor’s vehicle.
According to the driver “this accident [which] unfolded as the other two vehicles passed him”. The statement seems to contradict that he pulled out in front.
According to diagrams in the NYTimes, the right front of the Gov’s SUV hit the center of the side of the red truck. Since it was not head-on, and both vehicles were going in the same direction, this would have pushed the SUV towards the center guardrail regardless of the SUV driver’s actions.
http://www.nbc10.com/politics/11828547/detail.html?dl=mainclick
Check the link; the red truck was being passed by the white one and the SUV. I believe norwaypinesavage has it exactly right. The red truck said he pulled back onto the road after avoiding the accident.