Mexican presidential candidate Cuauhtemoc Cardenas, a Vicente Fox rival, also made the rounds in the U.S., speaking at Cal State Northridgein 2000. (George Wilhelm / Los Angeles Times)
Sen. John McCain, now the presumptive Republican nominee for president, leaves the Elysee Palace in Paris after a meeting with French President Nicolas Sarkozy in July 2007. (Patrick Kovarik AFP/Getty Images)
As a presidential candidate, former New York Mayor Rudolph W. Giuliani, traveling with his wife, Judith, sought out British Prime Minister Gordon Brown at 10 Downing Street in London. (Edmond Terakopian AFP/Getty Images)
Sen. John McCain, in red cap, met with U.S. and Iraqi military leaders in Mosul, Iraq, in March. (Patrick Lair/U.S. Army via Getty Images)
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Gordon Brown was Britain’s chancellor of the exchequer when he pondered questions at a press briefing at the International Monetary Fund headquarters in Washington in 2000. Now prime minister, he is one of the foreign leaders most frequently consulted by U.S. presidential candidates. (J. Scott Applewhite / Associated Press)
This week, Democratica presidental candidate Barack Obama was across the table from Iraqi Prime Minister Nouri Maliki, right, in Baghdad. (Thaier Al-Sudani / EPA)
On his Iraq trip, Barack Obama made an aerial tour of Baghdad with U.S. Gen. David Petraeus and Nebraska Republican Sen. Chuck Hagel. (Staff Sgt. Lorie Jewell via AFP/Getty Images)
