You will get a wide range of answers to this question, especially if it is moved to the discussion section, as everyone has their own motives and opinions about the proper role of government.
One thing I would like to change is the Filibuster Rule in the US Senate. Originally, it was designed as an occasional parliamentary procedure that would require 60 votes to invoke cloture and stop a Senator from commenting on the floor of the Senate. Otherwise, they could go on for days (and have) in order to delay a vote past when one is possible. It used to be this was only for make or break issues, and would only take place once or twice a year.
In the 111th Congress, more than one hundred filibuster attempts took place in the first 11 months of the Congressional term, a new record. Democracy was not meant to be tyranny by a minority, and the use of the filibuster as it is today simply obstructs the ability of government to deal with the most pressing problems of the country. A democracy should be majority rule.