In 2006, British Prime Minister Tony Blair described the main cleavage in politics as not left versus right, but open versus closed. According to Blair, attitudes towards social issues and globalism are more important than the conventional economic left–right issues. In this model, "open" voters tend to be socially liberal, multicultural and in favour of globalism while "closed" voters are culturally conservative, opposed to immigration and in favour of protectionism. The open–closed political spectrum has seen increased support following the rise of populist and centrist parties in the 2010s.