In a presidential system, a unity ticket is a form of ticket balance in which a candidate and a running mate of separate political parties run on a single ticket. Candidates may retain their separate political parties for the duration of the election, or they may adopt a new party name to represent their unified platform. In a system where the running mate is next in line for the presidency, a unity ticket can cause a mid-term shift in policy if the president dies or is removed from office. Unity tickets are common during periods of political realignment.