This site has a number of amazing quotations from Humbert Humphrey.
This first seems to be appropriate for a question seeking quotes.
"It is all too easy for a society to measure itself against some abstract philosophical principle or political slogan. But in the end, there must remain the question: What kind of life is one society providing to the people that live in it?"
A few others
"When we say, 'One nation under God, with liberty and justice for all', we are talking about all people. We either ought to believe it or quit saying it ."
"I believe that each of us can make a difference. That what is wrong can be made right. That people possess the basic wisdom and goodness to govern themselves without conflict."
"There is no such thing as an acceptable level of unemployment, because hunger is not acceptable, poverty is not acceptable, poor health is not acceptable, and a ruined life is not acceptable."
"Peace is not passive, it is active. Peace is not appeasement, it is strength. Peace does happen. It requires work."
And my personal favorite:
"The moral test of a government is how it treats those who are at the dawn of life, the children; those who are in the twilight of life, the aged; and those who are in the shadow of life, the sick, the needy, and the handicapped."
And for Paul wellstone
http://en.thinkexist.com/quotes/paul_wellstone/or
http://www.wellstone.org/archive/article_detail.aspx?itemID=5415&catID=3605“Politics isn't about big money or power games; it's about the improvement of people's lives”
“Never separate the life you live from the words you speak.”
“We need a new kind of citizenship, so that we can see citizens as themselves earning the rank of patriot because of their involvement in their community affairs….We as a society need to be encouraging people to focus not just on individual wants but on serving the larger community.”
"The people of this country, not special interest big money, should be the source of all political power.”