Leaders of St. Paul's Democratic-Farmer-Labor party will endorse a candidate for mayor at their city convention tomorrow. St. Paul's incumbent mayor, Norm Coleman, was elected as a DFLer four years ago but since then has switched his allegiance to the Republican party. DFL convention delegates will select either State Senator Sandy Pappas or City Council member Bobbi Megard to challenge Coleman. Minnesota Public Radio's William Wilcoxen reports.