future security. On 29 May 2008, the ADR deputies and Jaerling were the only members not to vote for the Treaty of Lisbon. In the 2009 Chamber election, the ADR held on to four seats (of which, 2 in Sud), but with a reduced vote share of 8.1%: its worst legislative election result since its first election, in 1989, whilst its vote share fell - albeit by less - in the simultaneous European Parliament election, to 7.4%. Jaerling, running for his own Citizens' List, failed to win a seat in either. This had been in spite of strong pre-election polling, the difference likely to be attributable to the financial crisis pushing voters to more familiar parties. On 8 June 2010, the ADR joined the Alliance of Conservatives and Reformists in Europe, a Euro-Realist Europe-wide political party. In the snap-election of 2013, the ADR once again fell in their share of the vote, from 8.14% to 6.64%. However, they did manage to regain one seat, having fallen to only two MPs after the defections of Jacques-Yves Henckes and Jean Colombera. The former sat out the 2009-2013 legislative period as an independent, the latter founded the Party for Full Democracy. Roy Reding regained the mandate in the Centre district, putting the party back at 3 mandates. During the Constitutional Referendum Campaign of 2015, the ADR was the only party to explicitly campaign for the "3 x No" vote, thereby rejecting the opening of the right to vote for 16 year-olds and foreign residents, as well as rejecting the idea of limiting minister mandates to 10 years. This campaign was in stark contrast to the campaign of the largest party, the CSV, whose main message was to "be informed" when voting. With each question being rejected by between 70% and 80% of the electorate, this event represented a big political win for the ADR in face of the incumbent Government. 3 years after the Referendum, on 2 March 2018, the ADR announced that it would be co-operating with the citizen's movement Wee 2050 - Nee 2015, which had been founded pre-referendum to campaign for the "3 x No". The cooperation agreement involved Wee 2050 having up to 8 places on the ADR's electoral lists for the legislative election of October 2018, and ensured that the movement could remain relatively independent by not requiring the Wee 2050 candidates to be members of the ADR