TIM McCarthy - the fearless Secret Service agent who took a bullet for President Reagan during a 1981 assassination attempt - is livid at the new Fox action flick, "The Sentinel," in which Michael Douglas portrays him as a two-timing rake. McCarthy - thinly disguised as "Pete Garrison," who also saves the president's life - is no pillar of morality in the PG-13 flick, which opened nationwide last Friday. His character is blackmailed over an affair he's having with the first lady, who's played by Kim Basinger. He's also framed for the murder of another agent. My daughter saw it...