A look at the day ahead in European and global markets from Tom Westbrook In icy Iowa, Donald Trump appeared set to win Republicans’ endorsement in the first-in-the-nation presidential nomination contest by an unprecedented margin. His win had been predicted by opinion polls but was nevertheless a strong start to his election bid and suggests that investors ought to brace for a bumpy ride as he injects volatility into the debate over trade and foreign policy and, likely, into financial markets. In snowy Davos on Monday, European policymakers sent a tremor through bond markets with hawkish rema…