John Boehner’s answer:

We chose a small business because jobs are the number-one priority of the American people. And small businesses are the engine of job creation in America. Tart Lumber is a quintessential, typical American family-run small business. This is not the kind of agenda you unveil on the Capitol steps. We wanted to underscore the jobs point, and get outside the Beltway, because this document was built by listening to the people outside of Washington.

He also says:

The Contract was rolled out on the Capitol steps. Doing the same thing today wouldn’t have fit. Job creation is at the top of this agenda, which was built by going outside the Beltway and listening to the people. We wanted to underscore that point.

More from Boehner on the pledge here.