A peaceful protest in Denver last night turned ugly as police in riot gear blocked progress of a march down a public street, turning tear gas and paintballs on the corralled crowd, according to the American News Project. In a city that looks to one observer more like a fortress, many protesters were demonstrating against Barack Obama. Around 80 people were arrested. A preamble to St. Paul, where audiences are expected to be less sympathetic to the crowd gathered in the convention center?