GREENSBORO, N.C. After weeks of riveting and often salacious testimony about an extramarital affair and the elaborate lies that once kept it hidden, testimony in the John Edwards trial turned Monday to a more prosaic topic: campaign finance law. As Edwards' legal team opened his defense, the finance director for his failed 2008 presidential run testified that more than $900,000 from two wealthy benefactors was not reported as campaign contributions because it represented private gifts intended for personal expenditures.