Final answer:
For incumbents running for reelection, their service to constituents is a notable asset. This includes assisting with federal benefits or immigration issues and publicizing these efforts. Such advantages are part of the incumbency advantage.
Step-by-step explanation:
An especially important asset for incumbents running for reelection is their service to constituents. Incumbent members of Congress have the advantage of established name recognition, access to resources, and the ability to leverage their position to assist constituents with issues like federal benefits or immigration challenges. Additionally, their publicity efforts, such as detailing their casework on websites or through advertisements, are effective in earning voter support. These factors contribute to what is known as the incumbency advantage, which includes a high rate of reelection due to these institutional benefits, which are wielded to serve election objectives.