Final answer:
The incumbency advantage in congressional elections leads to a high reelection rate for incumbents. This advantage is due to factors such as name recognition, campaign financing, and access to resources and state power. Incumbents can effectively address the concerns of their constituents through various means.
Step-by-step explanation:
The incumbency advantage refers to the high rate of reelection enjoyed by incumbents in congressional elections. There are several reasons why the reelection rate is so high. First, incumbents have greater name recognition among voters, which makes them more likely to be selected. Additionally, incumbents often have an advantage in campaign financing, as donors are more likely to support a proven winner. Furthermore, incumbents have access to resources and state power that can help them address the concerns of their constituents, such as through constituent casework.