Not every marketing campaign you run generates the same type or quality of leads. This is what makes this question so interesting. It's a chance for you to see how a marketing candidate thinks about the buyer's journey and what that journey should look like in your company.

If you do pose this question to a candidate, don't expect him or her to know exactly how your business generates its leads. The ideal answer simply demonstrates an awareness of your customer and perhaps some on-the-spot brainstorming the candidate might be asked to participate in while on the job.

Expect follow-up questions from the interviewee, too, especially if you pose this question to a more experienced candidate. For example, they might ask how qualified the leads should be, or how leads are scored as a result of this hypothetical campaign. The specific parameters matter less than the follow-up question itself -- a positive sign of an analytical marketer.