As Democrats and Republicans to come up with a budget plan, the odds of a government shutdown increased.

A NASA spokesman told Computerworld that while a shut down that lasts only a few days should not affect the scheduled April 29 shuttle launch, a longer shutdown would. If the federal government is closed for a week or more, the Endeavour would not be able to lift off as scheduled, the spokesman said. "We would have to re-evaluate," he said.

The upcoming launch is the last one for Endeavour before the .

Endeavour already has had some tough luck on its final space venture. Last week, NASA had to push back the shuttle's launch date by 10 days because of a scheduling conflict.

The space agency had to scrap the initial launch date of April 19 because of a conflict with a Russian Progress supply vehicle that is set to launch April 27 and arrive at the on April 29. On the initial schedule, Endeavour would have been docked at the space station when the Russian vehicle arrived, and the station is not equipped to handle two spacecrafts at the same time.