The stakes could not be higher. The SNP look certain to sweep the board at the general election, with Labour being reduced to a rump party north of the border and the Lib Dems being wiped out all together.
This predicted victory puts the SNP in the controlling seat when negotiations on forming the next government kick off in just a few weeks time.
And while Labour have tried to play down the idea of a coalition, or any sort of confidence and supply arrangements, party apparatchiks are increasingly coming round to the reality.
What is also clear is that Nicola Sturgeon will use every tactic, not only to ensure that Scotland gets some preferential deal, not just complete fiscal autonomy, but that every one of her left wing, anti austerity policies are introduced.
A return not just to the New Labour vision for the UK, after all we have barely moved on from this, but a dangerous experiment with the sort of socialism that Margaret Thatcher trounced in 1983.
Turn on the taps of Government expenditure, increase taxes, ditch plans to stop abuses of the immigration system, scrap Trident and deny voters a referendum on EU membership.
On social policy too the SNP prove they are as mad, bad and dangerous as Michael Foot’s Labour Party.
In 2014 the Nationalists decided that every child in Scotland should have a named person, a state employee, to oversee their “wellbeing”. The scheme, due to be rolled out next year, will allow bureaucrats to share personal data, advise and counsel children without their parents’ consent – even encouraging children to disobey their parents. This single policy marks the biggest ever state power grab over children and will lead to all sorts of problems in coming years.
They oppose tax breaks for married couples, even though the current benefits system means that a couple can be worse off to the tune of £7,000, and they want to criminalise any parent who disciplines their child with even the gentlest of smacks.
And this does not even address that long held and stated aim, the destruction of the United Kingdom. The SNP is a real threat to our country, economic recovery, international prestige, and way of life.
So David Cameron is right to play the nationalism card. After all, in the absence of any other strategy, or popular policy (extending right to buy was announced far too late in the campaign) this last throw of the political dice might be the only thing standing between us and Queen Nicola.
Yes, it would be fair to say that had the Conservative campaign been more exciting, the party might not have to fan the flames of nationalism, but there really is little other option.
Polling suggests that neither the Labour or the Conservative campaigns have shifted public opinion, with both of them stubbornly stuck in the low 30s and any movement being within the +/-3 per cent margin of error.
And while I have sympathy with the comments of former Scottish Secretary Lord Forsyth about the risks, the reality is this has been a dangerous game that the Party has been largely absent from since the 1970s. Labour was first to promote a vicious anti-Tory form of politics and were very successful. After all they saw every Conservative MP expunged from Scotland by 1997.
Labour deliberately and shamefully played an anti-English line in Scotland, telling those north of the border how hard done by they were; how they had an entitlement to huge wads of English cash and benefits; and how the nasty Tories were destroying their country with savage cuts and inhumane policies.
The culmination of the years of hatred was the rise of Scottish nationalism/SNP, the devolution referendum and the Holyrood Parliament.
The Conservative Party’s muted response was to surrender the field to the haters, failing to challenge the view that the Tories are no different to a wicked stepmother in some Grimm fairy tale.
So I am pleased that the PM is finally joining the struggle. Delighted too that whether for political expediency, or because he actually believes it, Mr Cameron realises the dangers of a Labour Government propped up and controlled by an anti-English left wing SNP.
I only hope he has not left it too late.