Without control of the White House or Congress, the new DNC chair will lead the campaign arm of a Democratic Party that is still figuring out how to move on from rejection at the ballot box.
Köhler, a onetime head of the International Monetary Fund who became a popular German president before resigning abruptly in a flap over comments about the country's military, has died at 81.
Siegel is the first American to be released as part of this deal. A total of 18 hostages have been released since the ceasefire took effect. Hundreds Palestinians have been released so far.