What's The Point of Life for a Politician?

The general populous believes the dynamic behind, 'living to make a better day for the people who follow behind us,' is our creed as human beings. As a believer in God, you live for Him. As a non-believer, to find meaning in this life may seem difficult at the initial introduction of the question, but the most agreeable answer is, "to make a better tomorrow." Only the most selfish of us have truly convinced ourselves that the accumulation of money is our purpose. 
While watching a movie about the black empowerment movement in the late 1960s and early 70s, with one of the closing lines of the movie summed up the three stages of the movement, along with the many tactics with one simple purpose behind them all: to make a better life for their children. And with those words, it immediately struck me in the present time, those things still apply, but are still hindered by the same things. The government's skewed agenda, full of people who have forgotten their purpose. 
Government is full of two types of people; those who have come from unjust circumstances looking to make a change, and those coming from money looking to change things for financial benefits. And at the end of the day, none of which stand for anything more than their own personal gain. But could you imagine if Congress was constantly trying to setup America for a better tomorrow rather than a better NOW. When, and how did we become so selfish? The very people put in charge, care no more about the preservation of America than our "enemies."