Obama Wades Back Into Immigration Debate, as Critics Warn of 'Amnesty'

President Obama, just days into his second term, is pressing ahead on the explosive issue of immigration reform -- boosted Monday by a bipartisan group of senators drafting a proposal of their own while running into early criticism that the blueprint amounts to "amnesty."  The president is traveling Tuesday to Las Vegas, where he will outline his immigration reform goals, said to be similar to those he championed during the campaign. The issue was put on the back burner during his first term -- overtaken by debate over health care legislation and economic measures. But along with gun control, it one of the top items on his second-term domestic agenda.  Eight U.S. senators got ahead of him Monday, unveiling a blueprint that calls for, among other things, a path to citizenship for the 11 million illegal immigrants already in the United States.  But White House Press Secretary Jay Carney said the president "welcomes" the proposal, saying it represents the "bipartisan support coalescing" behind certain principles of immigration reform.