As politicians embark on their final days of campaigning for Bosnian elections on Sunday, there is one small corner of the country where they cannot pass: Podgora, a poor hamlet fed up with the government's broken promises. "You've been lying to us for years. No party is welcome in Podgora," reads a white banner strung across the main square of the 700-person village, which lies some 30 kilometres (18 miles) from the capital Sarajevo.