Final answer:
Rallying events can affect presidential politics by boosting public approval ratings and shaping public opinion.
Step-by-step explanation:
Rallying events can affect presidential politics in several ways. One way is that they can boost public approval ratings for the president. For example, after the 9/11 attacks, President George W. Bush's approval rating increased significantly. However, these spikes in approval ratings are usually temporary and don't last long. Another way that rallying events can affect presidential politics is by influencing public opinion and shaping the narrative around certain policies or actions taken by the president. This can lead to increased support or opposition to the president's decisions.