Final answer:
The override vote for President Obama's veto of JASTA may differ from the original vote due to changes in political pressure, public opinion, negotiations, or other strategic considerations by members of Congress. A two-thirds majority is required in both the House and the Senate to override a presidential veto, which reflects the substantial support needed to overcome the president's objections.
Step-by-step explanation:
President Obama's veto of the Justice Against Sponsors of Terrorism Act (JASTA) was overridden by Congress, with the final vote count being 348-77 in the House and 97-1 in the Senate. The reason the vote totals for the override vote may differ from the original vote is due to various factors such as political pressure, public opinion, or new information that could influence legislators to change their vote and support the override.
Vetoes tend to be used as a last resort by presidents, and Congress has the power to override a presidential veto with a two-thirds majority in both the House and the Senate. It's important to understand that the dynamics around veto situations can be complex. Members of Congress might alter their positions on a bill after a veto due to increased awareness of public support for the bill, election year pressures, or in negotiation for other legislative priorities. The significant differences in vote totals reflect these changing conditions and the high stakes involved in overriding a veto, which happens infrequently.