Combine all ingredients except orange sections in large saucepan. Bring to a full boil, stirring to dissolve sugar. Reduce heat and simmer for 8 minutes, stirring occasionally, until berries burst. (Sauce thickens when chilled.) Cool. Transfer to bowl, cover and chill. Stir in orange sections. Sauce can be prepared up to 1 week ahead. Stir in oranges the day sauce will be served.