SNP went on to win the 2008 Glasgow East by-election and the largest share of the Scottish popular vote in the 2009 European Parliament election. The SNP exploited voter fatigue with Labour – a 2006 poll found 56% Scots believed Labour had been in power in Scotland for too longer, the fallout from the 2003 invasion of Iraq and the power struggle between Tony Blair and Gordon Brown which eroded Labour's popularity. Devolution had clearly become a turning point in the SNP's electoral fortunes, as while it would struggle for relevance in a UK election, the devolved parliament provided the SNP with oxygen it otherwise could not compete with Labour. As all of the SNP's MPs made the switch to the Scottish Parliament while only a handful of Labour MPs followed suit, the clear contrast in commitment to Scotland further the SNP's narrative that it, not Labour, was fighting for Scotland's interests. Salmond became the first pro-independence Scottish leader since the Act of Union of 1707. The 2010s The 2010 UK general election proved disappointing for the SNP, as the party only retained their six seats without making any gains, although they did overtake the Liberal Democrats to become the second-largest party on the popular vote share. Majority government in Holyrood The 2011 Scottish Parliament election, however, delivered the first majority government of the devolved Scottish Parliament as the SNP won a landslide of 69 seats, considered a remarkable feat as the Additional Member System used to elect MSPs was originally implemented to prevent single-party governments, as well as to produce proportional results. Following the result, the leaders of all the main opposition parties resigned their positions. The SNP's victory came on the back of the collapse of the Lib Dems, who was tainted by its participation in the Conservative-led UK Government, while Scottish Labour had clearly failed to inspire voters in opposition. Later, the SNP confirmed its intent to hold a referendum on Scottish independence. Independence referendum campaign In October 2012, the SNP voted at its party conference to change their stance on NATO, supporting continued membership for an independent Scotland. This was widely seen as the resolution of the long-standing NATO debate within the party. In response, two MSPs – John Finnie and Jean Urquhart – resigned from the party and became Independent MSPs. Another MSP, John Wilson, followed after the independence referendum. In November 2013, some policies