It depends. Technically, you can participate in the election according to the NLRB, because you don't actually do the firing (green sheets by yourself), and raises (have to have managements okay to enter it in, actually), promotions (you can suggest, but management is the deciding factor). Since an hourly doesn't meet these criteria you can vote in the election according the NLRB. If you want to vote, let  your union know if  there is an election or union presence occuring in your store. Find out safely what union is trying to come in and contact them at home, telling them that you want to participate. The reason you should contact them is if they don't know supervisors (hourly) are interested, then it's very likely they won't include you in the list of areas to represent. Keep in mind that Wal-Mart will fight to keep you from voting if most of the supervisors want a union, but if most don't, then they will push to get the supervisors to vote.