Hoffmann led the 'Committee for the No' that campaigned for a 'no' vote in the 2005 referendum on the ratification of the European Constitution. However, in the face of otherwise widespread support for the Constitution, the committee's reliance on socialist arguments and figureheads like Hoffmann limited the movement's effectiveness.[2]
In the 2009 elections, Hoffmann was returned to Parliament as the Left increased its share of the vote to 3.3%. Hoffmann's personal vote of 9,067 in the south constituency was almost equal to the total number of votes gathered by all Communist Party candidates standing (a total of 10,803 votes).[3]
^Dumont, Patrick; Poirier, Philippe (December 2006). "Luxembourg". European Journal of Political Research. 45 (7–8): 1191. doi:10.1111/j.1475-6765.2006.00674.x.