Though the mosque is rarely used for religious ritual, even during the holy month of Ramadan, which begins June 5, it remains a powerful emblem of Muslim heritage and pride. And in this particular election year when Muslim immigrants have been made a polarizing part of the political discussion, this obscure mosque in an isolated stretch of a rural state serves as a reminder that Muslims have been part of the American mix for a long time, and not only in populous hubs like Brooklyn; Dearborn, Mich.; and Chicago’s western suburbs.