You can’t teach an old dog new tricks in the eyes of Republican presidential candidate Ron Paul.     The Texas congressman had some harsh words for the GOP presidential frontrunner John McCain, a longtime U.S. Senator, on various issues including what Paul alleged was a one-time alliance with former Vice President and global warming cheerleader Al Gore.     “Now our leading candidate – guess whose position he holds on global warming? Al Gore, he supports the Al Gore bill on global warming.†     Paul spoke to the conservative audience at the Conservative Political Action Conference on February 7 in Washington, D.C.     ...