Dedecker became well-known first for his long career as a judo coach, with his judokas winning for Belgium unprecedented number of medals (among them four times Olympian gold), and then for his politics.

"[3][4] The local VLD party in Ostend, led by Bart Tommelein, does want to pursue a city coalition with the Socialist though.

[6][7] Somers stated that in the last few days Dedecker has showed himself to be a "inveterate trouble maker who keeps on creating damaging battles in his own party.

[11] After being expelled from the VLD Dedecker looked into starting a new liberal party, which might have seen the involvement of Hugo Coveliers of VLOTT, and law professor Boudewijn Bouckaert.

[14] The Christian Democratic and Flemish party (CD&V), with whom the N-VA had an electoral cartel agreement, stated they didn't want to be in league with Dedecker and broke off the association.

In September 2006, Dedecker told the press that he had the names of three Belgian cyclists, who went to Italy for illegal doping treatments.

In January 2007, Belgian cyclist Johan Museeuw admitted that he took stimulants during the last years of his cycling career, and that he confided this earlier to Dedecker.

[15][16] The information Dedecker gave in September 2006 led to house searches throughout Belgium in June 2007 of persons related to cycling.

On 4 January 2007, Dedecker explained his plans by stating that he wanted to be the Flemish party political equivalent of Geert Wilders and Pim Fortuyn.

In October 2009 he published the book Headscarf or Blindfold in which he criticized mass migration and advance of Islam in Europe.

In the 2019 Belgian federal election, he stood for the West Flanders constituency as an independent candidate affiliated to the N-VA's list.