This is also due to the emergent gerontocracy, half the senate is >65.
Causes include incumbent advantage for elections, and the way each Congressional house tracks (and privileges) seniority in its members, which indirectly punishes States for any turnover in their representation.
Causes include incumbent advantage for elections, and the way each Congressional house tracks (and privileges) seniority in its members, which indirectly punishes States for any turnover in their representation.