Abstract
During the last 60 years, the proportion of careerists (congressmen elected ten or more times) has risen from 2.8 per cent to 20.0 per cent. The greatest increase occurred in the mid-1950s. The proportion of Southern Democrats numbered among the careerists has consistently been disproportionately large, with the number of Northern Democrats increasing, while Republican careerists have become relatively fewer. Fluctuations in the number of senior congressmen is not strongly influenced by national electoral patterns.The most frequent cause of careerists' leaving the House has been retirement. During the last decade the incidence of defeats in primaries and general elections has increased; the greater susceptibility of careerists to rejection by the electorate coincides with reapportionment and the involvement of new groups in the electorate interested in new issues.

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