What's this "Demographic" situation !

1. Explain how a particular demographic may be impacted by—or could impact—the election of one of the candidates for President.

In my definition, I thought that this was a difficult source to anonymously decide if this can be resulted to impact a candidate for presidential spot. I got an Idea that can probably affect John McCain since he really wants to just focus on the affects of the economy, but not really showing effort to stoop up the economy's problem financially. So, also many big things impact the demographics all the time like marketing, ratios of genders, ratios of race and much more daily affect our routine.
I believe that if a candidate was to get impacted by demographics for a good cause, I think that Obama would qualify since he is being open to many issues that our U.S. country falls behind like schooling for lower level ethnicities, and financially bank issues, weaponry equipment being bought for wars. All those issues, are studied through demographics and determine the ratio of problem and how it spreads through out the years.