Thousands of Occupy protesters from across the country are expected to converge Tuesday on Capitol Hill to take their message to the halls of Congress, in what some observers say is the movement’s overdue moment to engage the American political system. Protesters already have set up camps in public spaces, taken over foreclosed homes and shut down key shipping ports, but for the most part they have shunned the political system, viewing it as beyond salvation. The congressional protest – which falls on the movement's four-month mark and the beginning of a new session of Congress – appears to represent...