6 may. 2008
"Under the Democratic Party’s Rules, pledged delegates are not legally 'bound' or required to vote according to their presidential preference on the first ballot at the Convention. Rather, these delegates are pledged 'in all good conscience [to] reflect the sentiments of those who elected them.'
Superdelegates control nearly 20% of all the seats at the Democrat convention.
But if Forest Gump is with you: he can.