Final answer:
Name recognition is a major reason why incumbents are reelected. Incumbents have built up recognition through previous elections and voting on legislation, making them more likely to be chosen by voters.
Step-by-step explanation:
The major reason why incumbents are reelected is name recognition. Incumbents have an advantage because they have been in office before, and they have been able to build name recognition through multiple elections and by voting on legislation. This name recognition makes voters more likely to choose them over unfamiliar challengers. Additionally, incumbents often receive financial support from interest groups and political action committees, who are more likely to support candidates with a proven track record of winning.