Summary: U.S. stocks gained steam on Tuesday as oil prices crossed $50 a barrel. Supply outages in Nigeria boosted sentiment for the closely watched commodity. Valeant Pharmaceuticals shares sunk after slashing its profit outlook for the year. It now expects earnings between $6.60 and $7 a share, compared to a previously reported range of $8.50 to $9.50. For the first quarter, the troubled drugmaker reported earnings of $1.27 a share, missing estimates of $1.37. FedEx raised its quarterly dividend to 40 cents a share, from 25 cents. That's a 60 percent increase. Shares are up 1.4 percent on the news. TheStreet's Scott Gamm reports from Wall Street.
