Stock indexes were unable to hold onto their morning gains on Wednesday, ending the day down about 0.5%.To begin Thursday, that decline looks set to continue as the morning news is grim, and a Jobless Claims report failed to indicate any turnaround in the labor market. Just before 8am EST, Dow futures were down 43 points, S&P 500 futures had fallen 5.6 points, and Nasdaq futures had slid 9.75 points. Speaking to Bloomberg News on Wednesday, former Fed Chairman Alan Greenspan said that “until...