Answer :
Incumbency helped the members of congress to stay in office longer because with incumbency the incumbent can use his office to for favours for his individual constituents.
He could easily increase his visibility among the general public and can easily provide the additional financial support to the future campaigns.
Incumbency offered the incumbent a large electoral advantage to make it quite difficult for the incumbent to be defeated in the general elections.
In this the voters were more likely to vote congressional candidate whose name is recognized by them.
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