Instead of promising to fix things if elected, they should start the ball rolling by introducing the legislation now. I'd be much more impressed with a candidate who said "I believe that [whatever] is how to fix [problem of the day], so I've introduced legislation to do this" then one who says "If elected I will [whatever] to fix [problem of the day]."
Of course, I'm probably being an unrealistic idealist to think that any of the noticeable candidates would do such a thing. After all, why fix things as a senator when you can become the savior when president.