DENVER-- In a highly anticipated Senate debate here Friday, Republicans launched early-round attacks against a bill that aims to create a mid-level state-university tuition rate for undocumented students who have graduated from Colorado high schools. Although the bill easily weathered the GOP barbs in the Democrat-controlled chamber, passing on a 20-13 voice vote, the two-hour back-and-forth showcased the lines of argument opponents of the bill will seek to sharpen before it arrives a few weeks from now in the Republican-controlled House.