Duhamel has also hosted several television political broadcasts: À armes égales from 1970, Cartes sur table on Antenne 2 from 1978, succeeded by L'Heure de vérité, and eventually 100 minutes pour convaincre from 2002, as well as Question Ouverte.

During the French presidential election of 1995, Duhamel, along with fellow journalist Guillaume Durand, hosted the television debate between Jacques Chirac and Lionel Jospin.

In 2006, Duhamel published Les Prétendants 2007, listing 20 likely contendants of the French presidential election of 2007, and notably ignoring Ségolène Royal.

A video of the event was released on Dailymotion, and Duhamel was suspended from his activities at France 2 and RTL until the end of the campaign.

[1] In 2009, Duhamel released La Marche Consultaire, a book which made comparisons between Nicolas Sarkozy and Napoleon.