Talk-radio icon Rush Limbaugh today suggested the existence of U.S. elections is now threatened by a move he expects President Obama to pursue – a mass amnesty for illegal aliens – following the passage of his massive health-care reform plan. "The next big push will be amnesty for ... millions of illegal immigrants who are here," he said on his radio program. "Obama's gonna need their votes in 2012. The Democrats are going to need their votes in every election from now on – if we have elections, and I'm not joking. "The Constitution has just been ripped to shreds,...