The federal Liberals are on a promotional blitz to tout a key promise in their latest federal budget aimed at one day providing extra benefits to the working poor.

The Liberals are keen to promote the changes and the extra $1 billion in annual spending for one of the few federal benefit programs that targets singles and families by subsidizing their wages with a tax credit.

Wednesday saw Liberals promote the benefit on social media and elsewhere: Prime Minister Justin Trudeau spoke about it in Toronto, as did Social Development Minister Jean-Yves Duclos earlier in Montreal.

The Liberals, though, face the same struggle as the previous Conservative government in selling the merits of a program that has cross-party support: It isn’t all that simple to explain.