Richard Nixon was the one who attested that he was not crook.
George Washington visited the area . He helped form an investment company to develop it and harvest timber there. Of course, he would not be President until 26 years later.
President John F. Kennedy visited West Berlin, after the dividing wall was built by the Russians, and he said: "Ich Bin Ein Berliner", meaning He was a Berliner. President Ronald Reagan vistaed West Berlin and said: "Mr. Gorbachev, Tear down this wall". A short time later the wall was torn down.
If you mean Mary, mother of Jesus, then she was visited before the birth by the angel Gabriel. Very soon after Jesus was born, she was visited by the shepherds. Much later (up to two years later), the wise men visited.
Most religious leaders would have. Many of those who later became religious leaders would also have various places they visited later become holy places.
John Hope was president of Morehouse College and later Atlanta University.
Kennedy Boulevard was originally Grand Central Avenue. It was renamed to John F. Kennedy Boulevard in 1964 after the President visited Tampa in November 1963 and was then assassinated in Texas a few days later.
President Diem in 1963.
George Bush
none to date (2013)
William Howard Taft was the first president to visit Mexico. He visited Ciudad Juarez on October 16, 1909. The next presidential visit wasn't until nearly 35 years later when Franklin D. Roosevelt visited Monterrey on April 20, 1943. There have been a total of 34 presidential visits to Mexico since Taft's inaugural visit, the latest being Barack Obama's visit to Toluca on February 19, 2014.
Richard Nixon failed to be elected President while he was Vice President, but later succeeded in being elected to this office 8 years later.