In fact, if you go down each category, you will see that only advertisers get inserted into the categories. So, somebody specifically went down each category and populated the whole "Best Of" list with only advertisers. The only way another store can be voted on is by writing them in. And when none of their advertisers fit a specific category? Well, rather than just selecting local stores to vote on, just leave the category blank forcing you to write in:
Note: I thought maybe that the list might be updated by writing in candidates, but no. This list has been the same since it launched on Monday (the same day I wrote in candidates for nearly every category).
So, in order to actually be forthright about their "contest", I propose that the State News officially changes their contest name to "Best of MSU's State News Paid Advertisers".