The Lib Dems have repeatedly said they support a mansion tax. Today they have a chance to vote for one.
This isn’t just a bygone pledge from their now notorious 2010 manifesto. Nick Clegg has made it the centrepiece of his leadership in the last few weeks. Kicking off the Eastleigh by-election last month, he called for "taxes on mansions, tax cuts for millions".
He said: "the mansion tax is an idea whose time has come" and that opponents of it should "join with the Liberal Democrats and the chorus of voices seeking to make our tax system fair." So it would be astonishing if Nick Clegg and his MPs today failed to back a straightforward motion supporting their long-held policy of a mansion tax on properties over £2m.
As Vince Cable himself said: "If it is purely a statement of support for the principle of a mansion tax, I'm sure my colleagues would want to support it."
And that's exactly the motion we tabled last Friday:
That this House believes that a mansion tax on properties worth over £2million, to fund a tax cut for millions of people on middle and low incomes, should be part of a fair tax system and calls on the Government to bring forward proposals at the earliest opportunity.
Is there anything in this motion that Liberal Democrat MPs disagree with? Asked this very question by Andrew Neil, the Lib Dem party president, Tim Farron, said: "none of it." And as Vince Cable’s friend Lord Oakeshott said last month: "If they [Labour] move a core Liberal Democrat flagship policy like that why wouldn’t Liberal Democrat MPs support it?"
That is a question every Lib Dem MP should ask themselves today. Because the government amendment today in the name of the Prime Minister is pure political fudge - it simply notes that "parts of the coalition" support a mansion tax and others don't.
So Liberal Democrat MPs shouldn't kid themselves that voting for David Cameron's amendment means they have voted for a mansion tax or done anything to help secure one. The Lib Dems have a simple choice – either they back their flagship policy by voting for today's motion or they don’t. No amount of wriggling or contortion can get them out of that simple choice.
At a time when the flatlining economy, cuts to tax credits and higher VAT means millions of working people are seeing their incomes squeezed like never before, there is a clear case for asking the wealthiest to make a greater contribution.
And Labour believes the funds raised should be used to introduce a new lower 10p starting rate of tax - putting right a mistake made by the last government. This would mean a tax cut for 25 million people on middle and modest incomes struggling with the rising cost of living.
After supporting a Tory tax cut for millionaires, a failing economic plan, a VAT rise and a trebling of tuition fees, we will judge the Lib Dems on what they do, not what they say.
Chris Leslie is Labour's shadow financial secretary to the Treasury