If anything, Joe Lieberman is a perfect example of why the Senate should be abolished,
When the Constitution was being thrashed out, the smaller colonies insisted on a legislative body that would give them some parity with the larger states. In their opinion, the House was not enough because the more populous states would have larger delegations. Senators were given 6 year terms to keep them from being swayed by outside influences.
Obviously that hasn't worked.
Perhaps the idea behind the Senate was a good idea in 1787, but it's a terrible idea now. The power that Senators exert for six years just makes re-election all the more expensive. Which makes Senators more willing to accept huge campaign funds (read bribes) from corporations.