There are many ways of summarizing the 2015 election. One way is to look at the size of the various political blocs in a historical perspective.
The “five blocs” division was one I made back in 1988 when I wrote my MA thesis on the development of the Danish political system. The problem was if the fragmentation of the system post-1973 had also led to a political polarization (answer: no) and one of the indicators was the development of support to centrist and extremist groups of parties. As we can see from the figure, the 2015 election is in fact characterized by a swing to the extreme right – but we should also observe a caveat: The extreme right group historically includes a number of anti-state parties but it is a bit of a hodge-podge. We have everything from anti-regulation Georgeists and libertarian Liberal Alliance over right-wing populists (Progress Party and the Danish People’s Party) to outright anti-democrats (e.g. the National Socialists and Peasant Party of the 1930s and 1940s) in this group.
Still, in 2015 both Liberal Alliance and the Danish People’s Party – different as they are – are outside the inner circle of parties actively seeking government office and as such they pose challenges to the established right-wing. We can also see that the losses suffered by the Liberals and the Conservatives put the core bourgeois parties back in 1973 and 1977 territory.
I’m not sure how to code The Alternative but opted to place it in the group of centre parties along with the Social Liberals. In that case, the political centre is more or less stable.
Traditionally, Danish parties have been divided into “Workers” and “Bourgeois” parties – with the Social Liberals and The Alternative coded as Bourgeois. This graph shows us that the close competition between a traditional left and right was a thing of the 1960s and 1980s. In the 21st Century, parties with a Socialist and Reformist background struggle to reach 40% of the vote.
Finally, we could take the history of the blocs from the 2015 election with the Social Liberals and The Alternative joining the “Red” or “Progressive” bloc. In a historical perspective we should note that the Social Liberals have joined forces with the Bourgeois parties several times, most notably during the VKR-era (1968-1973) and during the decade of Schlüter governments (1982-1990/93). Here, the rise of the Bourgeois parties – including the Danish People’s Party – since 2001 stand out. We could perhaps argue that while the Social Liberals controlled the median legislator between 1929 and 2001, we are now back in the situation from the 1920s where the political blocs actively fought over the control of the median.