How might rallying events/rally-round-the-flag effect (a domestic or international crisis), affect presidential politics?

Question

Quizplus · Accepted Answer

Rallying events tend to temporarily increase presidential approval ratings as people come together in a crisis and support their leader. This can provide windows of opportunity for the president to push for action on their agenda while they have public support. However, the effect is usually short-lived and does not guarantee reelection or ongoing popularity.

How Might Rallying Events/rally-Round-The-Flag Effect (A Domestic or International Crisis)