Competitiveness in national elections does not trickle down to state level

Ballotnews: "77.3% of incumbents faced no primary challenger. Of the 1,133 incumbents who did face a primary, only 95 were defeated by the challenger. Thus, 91.6% of all incumbents who faced a primary opponent won their primary. But, if all 4,985 incumbents who elected to run for re-election are counted, only 1.9% of incumbents did not make it to the general election."