Ferrell, who in January is heading to Broadway in a new one-man show titled "You're Welcome America: A Final Night with George W. Bush," reprised his famed impression of the president on the live "Weekend Update" special Thursday Night.
In an "impromptu" evening address to the nation, "Bush" spoke about the election between John McCain and Barack Obama — both candidates, he said, that are "heavily patriotized" and "display much characterization."
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Speaking to Fey again appearing as Palin, Ferrell informed her that the role of vice president was "the most important in the land" and that the "president can do nothing without checking with the vice president." Fey corrected him that he had it backward.
He later reached out to shake the hand of Darrell Hammond's John McCain for a photo-op of his endorsement of the McCain-Palin ticket. A visibly uncomfortable McCain tried repeatedly to walk away.
"Bush" went on to encourage Americans that when they went into the voting booth on Nov. 4, they should think of his face.
Ferrell at one point was surprised to learn about his low approval ratings, because he had several months ago declared the Oval Office a "bummer free zone."