Maine will mark Martin Luther King Jr. Day with seminars, worship services and speeches. It is also a state and national holiday, and following Friday’s state shutdown day gives Maine state workers a four-day weekend. Bates College in Lewiston begins the observances Sunday evening with a sermon by Barbara Savage, history professor at the University of Pennsylvania and author of a book on the politics of black religion.In Waterville, the annual MLK Day community breakfast will be held Monday morning. Students will cite their favorite quotes of the civil rights leader. Gov. John Baldacci will speak at the NAACP Martin Luther King Jr. breakfast at Orono.In Portland, an MLK gospel concert will be held Sunday night andthe NAACP’s Portland Branch will hold its 29th annual Martin LutherKing breakfast Monday.