The district attorney of Philadelphia announced his reelection campaign Tuesday, vowing it could be the start of something big for the Democrats nationwide. Larry Krasner was surrounded by a coalition of politicians, labor leaders and others as he announced his reelection run at Philadelphia’s main public access TV studios near Independence Hall. The two-term district attorney is running for a third term and believes it won’t be a problem for him to win reelection, but the margin of victory could be very important.