DAVOS, Switzerland (Reuters) - The rich and powerful were divided at their annual huddle on Wednesday over Barack Obama's threat to raise their taxes, with some saying it could hurt growth, but others arguing he was right to address capitalism's imbalances. Obama's State of the Union address focused on channeling middle class anger at inequality, including a call for a 30 percent minimum tax on millionaires that could make the wealth of Republican rival Mitt Romney a central election issue. It was delivered on the eve of World Economic Forum in the Swiss ski resort of Davos, which found many...