The bike is called an "Air Caddy" and it's pretty cool looking. I have to admit my ignorance of cycling when I say I've never seen anything like it. Below is a picture of "Mike R." and his bike.
From his blog, The Speed of Bike:
"I cycled out of Mt. Orab this morning to get to one of the key spots on the Underground Railroad: Ripley, Ohio and then on to Maysville, Kentucky. Ripley was only about 30 miles down the road. At 9 am on a Sunday morning it was a quiet place, so I rode down to the water to look across at where so many slaves had crossed to freedom....
"We had a powerful day, standing where giant souls stood and worked. It felt like standing on the bank of the Jordan that place of liberation for Israel. Here, people found liberty, but at far greater risk."