U.S. Stocks Advance on Upgrades, Gains Trimmed on Korea

March 26 (Bloomberg) -- Bloomberg's Courtney Donohoe reports on the performance of the U.S. equity market today. U.S. stocks rose on analyst upgrades, takeover speculation and a European plan to help Greece avoid default before erasing most of the gain amid concern tension was escalating between North and South Korea. Bloomberg contributor Keith McCullough also speaks. (Source: Bloomberg)