Horst Köhler is a German politician who served as President of Germany from 2004 to 2010. As the candidate of the two Christian Democratic sister parties, the CDU and the CSU, as well as the liberal FDP, Köhler was elected to his first five-year term by the Federal Convention on 23 May 2004 and was subsequently inaugurated on 1 July 2004. He was reelected to a second term on 23 May 2009. Just a year later, on 31 May 2010, he resigned from his office in a controversy over a comment on the role of the German Bundeswehr in light of a visit to the troops in Afghanistan. During his tenure as president, whose office is mostly concerned with ceremonial matters, Köhler was a highly popular politician, with approval rates above those of both Chancellor Gerhard Schröder and later Chancellor Angela Merkel.

Gerhard Fritz Kurt "Gerd" Schröder is a German lobbyist and former politician, who was the chancellor of Germany from 1998 to 2005. From 1999 to 2004, he was also the Leader of the Social Democratic Party of Germany (SPD). As chancellor, he led a coalition government of the SPD and Alliance 90/The Greens. Since leaving public office, Schröder has worked for Russian state-owned energy companies, including Nord Stream AG, Rosneft, and Gazprom.