When first democratic elections were announced in Croatia, Vrdoljak was among 200 top intellectuals publicly endorsing the moderate Coalition of People's Accord. By the end of campaign, he switched his support for the more hardline Croatian Democratic Union (HDZ) and Franjo Tuđman, with whom he developed a close friendship. On 30 May 1990, the new democratically elected Croatian Parliament convened and Franjo Tuđman was elected President of Croatia. Vrdoljak became one of country's six vice-presidents. As such, he was entrusted with the supervision of 1990 European Athletics Championships in Split.