Market Snapshot: U.S. stocks rally on Irish hopes, GM

Food company J.M. Smucker���s /quotes/comstock/13*!sjm Office-products retailer Staples��� /quotes/comstock/15*!spls Dollar Tree���s /quotes/comstock/15*!dltr In deal activity, Cardinal Health /quotes/comstock/13*!cah Demand for Treasurys declined,...