Intraday Update – tone shifting modestly negative

12:27 p.m. ET The market tone is shifting more negative, although modestly; partly because the earlier lead mega-caps (MGK -0.45%) had over the S&P equal weight index (-0.45%) has evaporated. There’s some geopolitical risk too with tensions in nuclear armed Pakistan boiling over. I don’t know much about the situation, but it has to do…