Well, Ramakrishna hegde gave up power in 1985, because he felt he needed to reaffirm people's mandate, after Janata Party didn't win too many seats in Loksabha Elections. He came back with even greater majority!
Sigh, Where are leaders of that caliber anymore?
Now, leaders talk proudly about in politics anything being possible, and how it is ok to have stigma of breaking a promise!