WASHINGTON – Retail sales fell for a second straight month in April, a disappointing performance that raised doubts about whether consumers were regaining their desire to shop. A rebound in consumer demand is a necessary ingredient for ending the recession. The Commerce Department said Wednesday that retail sales fell 0.4 percent last month. Many economists had expected a flat reading, and the April weakness followed a 1.3 percent drop in March that was worse than first estimated. Retail sales had posted gains in January and February after falling for six straight months, raising hopes that the all-important consumer sector of...