Germany's two major parties vow to keep fighting for votes past a traditional deadline, with surveys indicating a close race in Sunday's general election. Campaigning was set to end on Saturday, but German Chancellor Gerhard Schroeder and his conservative challenger Angela Merkel both say their parties will compete for votes until polling stations close Sunday. Opinion polls show a virtual tie in the general election between the coalitions led by Mr. Schroeder and Ms. Merkel, who has seen her strong early lead evaporate in recent weeks. Experts say there is a chance the two rival parties -- Mr. Schroeder's center-left Social Democrats and Ms. Merkel's center-right Christian Democrats -- will be forced to form a so-called "Grand Coalition." Mr. Schroeder has been in office since 1998. He called for early elections in May after his Social Democratic Party suffered major losses in key state elections.