Cambodia's tiny opposition fighting for democracy in one-sided vote

In white tuk-tuks kitted out with megaphones and banners, supporters of a tiny Cambodian opposition party wind down a dusty Phnom Penh street, rallying votes ahead of the country's one-sided election.
It will be a herculean task for the little-known Grassroots Democratic Party to win any seats in Cambodia's 125-member National Assembly at the July 23 election -- widely dismissed as a sham.