 PLOT: Since Senator Kelly died in the middle of the first movie, his  subsequent appearances have been impersonations by Mystique. But any  U.S. Senators personal and political obligations fill up nearly  every waking hour. Given that there is only one Mystique, and that  she impersonates several other characters in addition to appearing  as herself, "Senator Kelly" frequently disappears for hours or days  at a time. In the real world or even the comic book world, her  intermittent use of Kellys likeness would be quickly uncovered as  bogus by his family or staff.