Trading in the U.S. index futures suggests that Wall Street stocks may open Wednesday's session higher, as risk appetite perked up amid a rebound by European equities and oil. Crude oil is moderately higher ahead of Federal Reserve Chair Janet Yellen's first day of Congressional testimony. In the U.S. Presidential campaign, Republican candidate Donald Trump and Democratic candidate Bernie Sanders won the New Hampshire primaries handsomely. European stocks are rebounding strongly, with financial stocks rallying strongly after their recent sell-off. Meanwhile, the Asian markets experienced another session of sell-off.