“We know of no more crucial civil rights issue facing Congress today than the need to increase the federal minimum wage and extend its coverage.”
Statement on minimum wage legislation (18 March 1966) http://www.aft.org/yourwork/tools4teachers/bhm/mlktalks.cfm, as quoted in Now Is the Time. Dr. Martin Luther King Jr. on Labor in the South: The Case for a Coalition (January 1986)
1960s
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Martin Luther King, Jr. 658
American clergyman, activist, and leader in the American Ci… 1929–1968Related quotes

Remarks by the President on the Economy, Knox College, Galesburg, Illinois (24 July 2013) http://www.whitehouse.gov/the-press-office/2013/07/24/remarks-president-economy-knox-college-galesburg-il
2013

“The Republicans believe in the minimum wage -- the more the minimum, the better.”
Harry Truman at Akron (11 October 1948), Good Old Harry
Context: The title of this book is Our New National Labor Policy, the Taft-Hartley Act and the Next Steps. Get that: "The Next Steps" … They're going even further! … The Republicans favor a minimum wage — the smaller the minimum the better.
Context: Your old friend Congressman Hartley of the Taft Hartley team … has written a book … The title of this book is Our New National Labor Policy, the Taft-Hartley Act and the Next Steps. Get that: "The Next Steps" … They're going even further! … The Republicans favor a minimum wage — the smaller the minimum the better.
Context: Republicans approve of the American farmer, but they are willing to help him go broke. They stand four-square for the American home--but not for housing. They are strong for labor--but they are stronger for restricting labor's rights. They favor minimum wage--the smaller the minimum wage the better. They endorse educational opportunity for all--but they won't spend money for teachers or for schools. They think modern medical care and hospitals are fine--for people who can afford them.... They think American standard of living is a fine thing--so long as it doesn't spread to all the people. And they admire the Government of the United States so much that they would like to buy it. − Harry S. Truman, October 13, 1948, St. Paul, Minnesota, Radio Broadcast.

Presidential campaign (April 12, 2015 – 2016), Democratic Presidential Debate in Miami (March 9, 2016)

2000s, 2002, State of the Union address (January 2002)

Lost Rights; The Destruction of American Liberty http://www.jimbovard.com/Lost%20Rights%20TOC%20Intro%20Chapter.htm