On 26 April 2009, a referendum (de) was held on whether Berlin pupils should be allowed to choose between the ethics class, a compulsory class introduced in all Berlin schools in 2006, and a religion class.[11] The SPD, the Left Party and Greens supported the "Pro Ethics" camp for a "No" vote, stressing that the ethics class should remain compulsory, and pupils could voluntarily take an extra religion class alongside it if they so chose; the CDU and FDP supported the "Pro Reli" camp for a "Yes" vote, wanting to give pupils a free choice.[11] In East Berlin, an overwhelming majority[11] of 74.62%[citation needed] voted against the introduction of religious education.