Final answer:
The effect of 'historic privilege' in Congress provides benefits to incumbents, aiding in their reelection through advantages like the franking privilege and increased visibility.
Explanation:
Historic privilege in the context of Congress refers to benefits and advantages enjoyed by incumbents in office, such as the ability to send mail for free to constituents, known as the franking privilege. This privilege can be used to publicize incumbents' work and gain voter support, contributing to the incumbency effect, where incumbents have a higher chance of reelection due to factors like name recognition and access to resources.
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