Obama's current lead also reflects the large party-identification advantage the Democrats now enjoy - 55 percent of all voters call themselves Democrats or say they lean toward the party while just 36 percent call themselves Republicans or lean that way. Obama's personal ratings have improved, as well: 62 percent of voters overall say they have a favorable opinion of him compared to only 26 percent who have an unfavorable opinion. By comparison, McCain's ratings are 49 percent favorable to 37 percent unfavorable, representing a drop from his previous 54 percent favorable rating. Obama is trusted more to handle what may...