what causes this phenomenon of senators and congressmen keeping their seats 90+% of the time for decades? why even have elections if so few people change out?

>>510513789 (OP)
AIPAC money. If you suck up yourself to jews, you'll get AIPAC campaign money and win. They'll keep your around until you have a chance to win.

>>510513789 (OP)
The longer you serve, the more IOU's and influence you build up. You get better committee positions and can send more pork-barrel project to your state. Unseating incumbents is usually a significant financial loss for the state.

>>510515897
Only if everyone else doesn't unseat incumbents.
Also, elections are done by individuals, not States. Individuals voters are fundamentally irrational and aren't bound by self-interest, because if they were they wouldn't vote at all.

>>510513789 (OP)
You can help fix this OP, by ALWAYS voting against the incumbent, regardless of Party.