The Social Justice policy group proposed that non-working spouses should be able to transfer their £5,025 personal tax allowance to the family breadwinner, so reducing the household tax burden for many by about £1,000 a year.
The money would make it easier for a wife (or a husband) to stay at home to look after a young child or, indeed, an elderly relative. An extra £1,000 a year for a family on, say, £20,000 a year would be a valuable boost to the household budget.
But Mr Cameron's strong support for marriage contrasts sharply with the confused response from the Labour government.
Some Ministers accused the Conservatives of spreading "moral panic" with the report, which highlighted the dreadful plight of an inner city underclass riven with problems of debt, drug and alcohol addiction, worklessness and educational failure.
Gordon Brown said he already supported marriage through the tax code and cited Inheritance Tax as an example. But this is a strange support to marriage when one party has to die for the other to benefit.
Our new Prime Minister also said that politicians should not "moralise and lecture". This is pretty rich coming from the man who only three weeks ago was being hailed by his supporters for his "moral compass".
But Mr Cameron is not moralising. He is merely acting on the evidence that marriage stabilises society and provides the most secure environment to bring up children. We need more of his clear leadership.
