Spartacus (Kirk Douglas, Tony Curtis, Peter Ustinov; 1960) seems a plausible choice:
The Roman slave, Spartacus, organizes armed up-rising against pre-imperial Rome. He and his followers defeat Roman legions in open battle... then hang around in Italy to be slaughtered - all crucified along the Appian Way.Spartacus knows staying in Italy will lead to disaster, but his followers refuse to escape over the Alps. He resigns himself to 'death with dignity'.
Newt seems to have embarked on this course of action: 'take down Mitt at all costs'. Defeat the legions, then perish with honor. He's got to realize he has no chance at the nomination, so he's just hanging around to bring down Mitt.
Another option: The Great Escape. All-star cast - too many to list (1963).
[senior Allied officer] Ramsey: Roger's idea was to get back at the enemy the hardest way he could, mess up the works. From what we've heard here, I think he did exactly that.... Newt's idea seems to be to get back at Mitt the hardest way he can, mess up the works.
We'll see if manages exactly this.
Any other nominees?