Simplify the following text for a Grade 11 native English-speaking person.
Original: Speculation had particularly increased since the December 2004 Christian Democrat federal convention in DÃ 1\/4 sseldorf , when Wulff was re-elected deputy leader of the federal party with roughly 86 per cent of all delegates supporting him .
Simplified: in December 2014 , Wulff was re-elected deputy leader of the federal party with about 86 per cent of all delegates supporting him .