Stocks sinking as financial stocks plunge and investors brace for Friday's key jobs report. Evercore ISI's Mark Mahaney on whether the recent sell off is a buying opportunity for tech stocks. Former Fed Vice Chairman Alan Blinder says he is betting against the Fed raising interest rates to 6%. And Senator Ed Markey, who participated in Norfolk Southern's safety hearing on Capitol Hill, explains why he doesn't think the railroad operator is doing enough to ensure more derailments are avoided.