Scotland's Labour Party. The "Blairification" of the Labour Party has sent a good part of Labour's base in Scotland over to the SNP.
Scottish Labour is suffering from a ...to some extent self-inflicted – process of attrition. The process began in the mid-1990s, as Blair and Brown exchanged Labour's post-war interventionism for a programme of liberalised markets and finance-led growth. In response, Salmond carefully manoeuvred the SNP into the vacant left-of-centre space. The strategy worked. Research from the period confirms that Scots started to view the SNP as a progressive alternative to Blairism.
The first big break came at the 2003 Holyrood election: Labour lost 250,000 constituency and 225,000 list votes, the single biggest fall in its vote share at any point over the devolutionary era. Left-leaning voters – notably Catholics, trade unionists and public sectors – bled-away from Labour, moving first towards smaller, more radical parties such as the Greens and the SSP, and then towards the SNP, resulting in ever-larger electoral gains for Salmond.
The decisive rupture occurred last year, when traditional Labour strongholds such as Glasgow, North Lanarkshire and Dundee rejected the party line and voted in favour of independence. Appalled by the flaccid conservatism of the Better Together campaign, large numbers of working-class Scots (although by no means all) embraced constitutional radicalism. On 18 September, Scottish Labour won the referendum and saved the Union, but it did so at the cost of Labour Scotland.
The only appropriate term for what is happening to Scottish Labour is "Pasokification". Just as Greek voters abandoned PASOK, the established party of Greek social democracy, for Syriza, so Scottish voters are abandoning Labour for the SNP (albeit more gradually and under less acute conditions). Clearly, neither Salmond nor Sturgeon is Alexis Tsipras, and the current Scottish government can be frustratingly cautious in its approach to reform. But the overarching trend is unmistakable: in Scotland, the old left hegemony is breaking down and a new one forming in its place.
So play silly bugger centrist all you like, Mulcair, but keep an eye over your shoulder - the left one.