Normally I post a picture and give up a digital moment of silence. Many problems with that in this case.

The first problem is, the most appropriate picture I know of isn't a photograph

Second is, sister was too important. This from the Encyclopedia Britannica, via PBS's African American World Reference Room site:

Shirley Chisholm
(Born Nov. 30, 1924, Brooklyn, N.Y., U.S.)

American politician, the first black American woman to be elected to the U.S. Congress.

Shirley St. Hill was the daughter of immigrants; her father was from British Guiana (now Guyana) and her mother from Barbados. She grew up in Barbados and in her native Brooklyn, New York, and graduated from Brooklyn College (B.A., 1946). While teaching nursery school and serving as director of the Friends Day Nursery in Brooklyn, she studied elementary education at Columbia University (M.A., 1952) and married Conrad Q. Chisholm in 1949 (divorced 1977). An education consultant for New York City's day-care division, she was also active with community and political groups, including the National Association for the Advancement of Colored People (NAACP) and her district's Unity Democratic Club. In 1964 68 she represented her Brooklyn district in the New York state legislature.

In 1968 Chisholm was elected to the U.S. House of Representatives, defeating the civil rights leader James Farmer. In Congress she quickly became known as a strong liberal who opposed weapons development and the war in Vietnam and favoured full-employment proposals. As a candidate for the Democratic nomination for U.S. president in 1972, she won 152 delegates before withdrawing from the race.

Chisholm, a founder of the National Women's Political Caucus, supported the Equal Rights Amendment and legalized abortions throughout her congressional career, which lasted from 1969 to 1983. She wrote the autobiographical works Unbought and Unbossed (1970) and The Good Fight (1973).

Check the quotes from Ms. Chisolm at About.com's Women's History site. A small selection:

I was the first American citizen to be elected to Congress in spite of the double drawbacks of being female and having skin darkened by melanin. When you put it that way, it sounds like a foolish reason for fame. In a just and free society it would be foolish. That I am a national figure because I was the first person in 192 years to be at once a congressman, black and a woman proves, I think, that our society is not yet either just or free.

Of my two "handicaps" being female put more obstacles in my path than being black.

My God, what do we want? What does any human being want? Take away an accident of pigmentation of a thin layer of our outer skin and there is no difference between me and anyone else. All we want is for that trivial difference to make no difference.

When morality comes up against profit, it is seldom profit that loses.

It is not heroin or cocaine that makes one an addict, it is the need to escape from a harsh reality. There are more television addicts, more baseball and football addicts, more movie addicts, and certainly more alcohol addicts in this country than there are narcotics addicts.

Ms. Chisolm's passing can't be marked with no more than a picture.