Leading Democratic Politicians Address YearlyKos Convention (AP) CHICAGO -- Hundreds of political bloggers are meeting in Chicago to begin a four-day convention filled with panels, presentations and lectures by some of the nation's leading Democratic politicians. The YearlyKos Convention is in its second year and was started as a way for left-leaning members of the blogosphere to "proactively influence their government." As bloggers' influence in politics and campaigns increases, the convention has become an important destination for dozens of local, state and national liberal politicians. The conference will be capped off Saturday evening when six Democratic presidential candidates, including U.S....