In what way can political parties affect presidential power?

Political parties play a significant role in influencing presidential power primarily through their ability to provide support for the President's agenda. When a President belongs to a political party that has a majority in Congress, they are more likely to advance their legislative goals effectively. The party's members are often aligned with the President’s principles and policy objectives, which can lead to increased cooperation in passing laws and implementing initiatives.

Moreover, parties mobilize resources, grassroots support, and political capital to bolster the President's position and persuade other lawmakers to back the President's policies. This support from the party can help solidify the President's influence and ability to enact their vision, thereby enhancing the overall power of the presidency during their administration.

While other options may touch upon aspects of political power, they do not specifically relate to the direct support and influence political parties have in enabling a President to achieve their goals while in office.