This all depends on the state and the court's interpretation of vehicle. Some states consider a vehicle to be self-propelled only while others include the definition to include those that are human propelled, including bicycles. In short, you can be cited, but it depends.
In Colorado, YES!!! You can also get a DUI while roller blading, skate boarding and just sitting in a parked car without the keys even being present within the car. It's a money maker and it really makes me mad. They have taken it way to far... Trust me, I believe in NOT drinking and driving but the laws are out of hand!!