WASHINGTON (Reuters) - If Inauguration Day marked the official rollout of a tougher, bolder President Barack Obama, look for him to take it a step further on Tuesday night: his State of the Union address is expected to lay out an unabashedly liberal Democratic agenda to a U.S. Congress half controlled by conservative Republicans. With his poll numbers up, his supporters' expectations high and Republicans still in disarray after their lackluster showing in the November election, Obama would seem to have good reason to press ahead. ...