Each Friday until the N.H. primary on Feb. 11, The Exchange will focus on the latest news in the presidential race. The special Weekly N.H. Primary Roundup will feature state and national reporters, audio from the campaign trail, and occasional appearances by candidates. For the show's first segment on Friday, Jan. 10, NHPR will welcome Democratic presidential hopeful Deval Patrick, the former Massachusetts governor who jumped into the race about two months ago. Patrick left his job at the