In no particular order...
20. Richard Nixon (People forget he was a Senator)
In all fairness, Nixon served just 2 years before becoming Ike's Veep and was much more "active" in the House.
Da fuq?
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Inyoue: I am strongly against deathbead succession but, since that's the worst of his crimes I'd leave him at about 20th
LBJ: Mostly for his actions as president, not to mention my personal belief that he was responsible for JFK's assainaton, he did have the most to gain from it. Since none of it is related to his Senate Tenure he comes in at 18th on my list.