Can the boss's spouse have an impact on staff morale?

This question hit me yesterday. Can the person-in-charge's husband or wife (or girlfriend/boyfriend/significant other) bring the morale of staff up, or down, depending on their attitude toward the CEO, the company, or the employees who work there?

I think if they have regular contact with employees, they probably do, so bear that in mind when you come across people related to your company. Why? Because whether you like it or not, you are part of the company culture, and like everyone else there, help to set the tone and enthusiasm level. If your drop by the office, your positivity can help keep people's spirits up when they've otherwise felt glum about what's gone on in their day.