NEW YORK (Reuters) - Former New York City mayor Rudy Giuliani is trailing in the race for the Republican presidential nomination even on his home turf of New York state, a new poll showed on Monday. The WNBC/Marist poll ahead of the February 5 primaries in New York showed 34 percent of registered Republicans support John McCain, compared to 23 percent for Giuliani. Among Republicans likely to vote, McCain kept his 34 percent support, while Giuliani was tied in second place with Mitt Romney at 19 percent. McCain's campaign has been boosted by wins in New Hampshire and South Carolina...