that depends on what your definition of “is” is.

Bush used “stay the course” until recent weeks when it became clear that it was becoming a political problem. “The characterization of, you know, ‘it’s stay the course’ is about a quarter right,” Bush complained at an Oct. 11 news conference. ” ‘Stay the course’ means keep doing what you’re doing. My attitude is: Don’t do what you’re doing if it’s not working — change. ‘Stay the course’ also means don’t leave before the job is done.”

isn’t it obvious?

keep doing what you’re doing, unless what you’re doing isn’t working. in which case, stop doing what you’re doing, but keep doing something.