The Constitution called for Senators to be elected by the state legislatures, not by a direct vote of the people. That might seem to show a bias against a popular vote for senators. Check this site for more information.
http://www.senate.gov/artandhistory/history/common/briefing/Direct_Election_Senators.htm
What bias did the FOunding Fathers demonstrate in their procedure for electing senators?
2 answers
explain how the cartoon reflects the cartoonists's biases