Over the next few weeks, the eyes of the nation will turn first to Denver and then to Minnesota's Twin Cities for the Democratic National Convention and Republican National Convention, respectively. As the population swells in each of the cities -- when delegates, media, and politicos come for some socializing, caucusing, and, yes, to see their candidate receive the official nomination of their party -- opportunities abound for local indie booksellers. Here is a look at what some Denver and Twin Cities bookstores are doing for the upcoming conventions.