Game won't download from Windows Store

Pendingdownload_medium

I purchased a game from the Windows Store, but it won't download. Every time I try to download it, it just sits there saying "Pending." Is there anything I can do to force the download to start? I've tried rebooting the computer and cancelling and restarting the download a bunch of times but I always get the same result. Does anyone have any ideas how to fix this?