The former mayor leads Clinton by five percentage points, 48 to 43. The Republican Giuliani holds a comfortable lead in the “red states,” topping Clinton by 17 percentage points, and he is even with Clinton in “blue states.” Giuliani has strong support among Republican voters, with 40 percent saying they are likely to vote for him. Arizona Senator John McCain trails with 18 percent, followed by former House Speaker Newt Gingrich, who has said he may not run if Giuliani holds a commanding lead. As for the Democrats, Clinton has the support of 38 percent of those polled. Illinois Senator...