Iowa ? A campaign van carrying Sen. Barack Obama’s wife collided with a motorcycle on a two-lane country road in central Iowa Tuesday, sending the motorcyclist to the hospital.

No one in Michelle Obama’s Chevrolet Uplander was hurt, although the van was not drivable. The campaign suspended her final event of the day.

The wreck occurred on State Road 65 as the two-car caravan headed to an event at a Franklin County park.

When the van, driven by a campaign aide, began to make a left turn, a motorcycle that had been traveling in the same direction and rapidly passing cars on the left crashed into the van’s left side. As the van came to an abrupt halt, the Honda motorcycle careened off the road and down a small embankment.

The motorcyclist, Iowa Falls hydraulic mechanic Tim Emerson, 40, landed on grass softened by three inches of weekend rain and lay motionless with a cut on his head. He was not wearing a helmet.