“I would rather be a one-term President and do what I believe is right than to be a two-term President at the cost of seeing America become a second-rate power and to see this Nation accept the first defeat in its proud 190-year history.”

Speech, Senate (1850), referring to the Compromise Measures.

1960s, October surprise speech (1968)
Context: What we won when all of our people united just must not now be lost in suspicion, distrust, selfishness, and politics among any of our people. Believing this as I do, I have concluded that I should not permit the Presidency to become involved in the partisan divisions that are developing in this political year. With America's sons in the fields far away, with America's future under challenge right here at home, with our hopes and the world's hopes for peace in the balance every day, I do not believe that I should devote an hour or a day of my time to any personal partisan causes or to any duties other than the awesome duties of this office — the Presidency of your country. Accordingly, I shall not seek, and I will not accept, the nomination of my party for another term as your President.

Campaign speech http://www.whitehouse.gov/the-press-office/2012/08/08/remarks-president-campaign-event, Grand Junction High School, Colorado, , quoted in
Furthermore compare what Obama said in 2009
2012
Context: Now, when we came together, we knew restoring that bargain — that deal, that compact — was not going to be easy. We knew it would take more than one year or one term or maybe even one President, because we had seen what had happened in the previous decade. Jobs had moved overseas. Folks were working harder and harder, but their wages or incomes, they were staying flat, sometimes even going down. The cost of everything from health care to college was going up. And then, it all culminated in the worst economic crisis since the Great Depression — a crisis that robbed too many of our friends and our neighbors of jobs, the value of their homes, their savings. And all that pushed the American Dream even further out of reach for too many working people.

Liza Minelli, as quoted in I Remember It Well (1975) by Vincente Minelli with Hector Arce, p. 395 https://books.google.com/books?id=D6jDtmiJCpkC&q=minelli+%22second-rate%22+%22first-rate+version%22&dq=minelli+%22second-rate%22+%22first-rate+version%22&hl=en&sa=X&ved=0CCoQ6AEwBGoVChMI0on3sqjdxgIVxHg-Ch1NhwVD; reprinted in "Judy and Liza, Part 3" https://news.google.com/newspapers?id=CfpjAAAAIBAJ&sjid=WuYDAAAAIBAJ&pg=7188%2C5401411 by Vincente Minelli, in The Sydney Herald (August 15, 1975), p. 8
Context: I couldn't sing Mama's special songs. I couldn't do them as well. I would rather present a first-rate version of myself than a second-rate version of Mama.

During the video conference with some MPs of EU parliament, March 1, 2005
Pet Phrases, 2005

[1965, ftp://download.intel.com/museum/Moores_Law/Articles-Press_Releases/Gordon_Moore_1965_Article.pdf, Cramming more components onto integrated circuits, PDF, 4, Electronics Magazine, 3 February 2010]

"We As Americans" (2004)
2000s

2016, DNC Address (July 2016)
Context: A lot has happened over the years. And while this nation has been tested by war, and it's been tested by recession and all manner of challenges — I stand before you again tonight, after almost two terms as your president, to tell you I am more optimistic about the future of America than ever before.
How could I not be — after all that we’ve achieved together? After the worst recession in 80 years, we fought our way back.

Answer to question seeking his views on limiting U.S. presidents to two terms, news conference, Washington, D.C. (October 5, 1956), in Public Papers of the Presidents of the United States: Dwight D. Eisenhower, 1956, p. 862.
1950s