Did you notice? No? Well, neither did most people in Carmarthenshire.
Calum was joined by not-so-local MP Owen Smith (Pontypridd) and Mark Fisher, Unison's branch officer in slightly-more-local Neath Port Talbot.
Owen Smith and Mark Fisher ought to have done a little more homework before joining their party colleagues in Carmarthenshire.
As Mark Fisher stomped around Ammanford, he tweeted, "join Labour in the living wage campaign also the ending of Zero Hours contracts
The Labour-led council in Carmarthenshire is planning to abolish trade union facilitation time and has regularly gone on the offensive against Mark Fisher's own union. The same council also vetoed proposals to introduce a living wage for council staff.
Of the 8,744 people currently employed by Carmarthenshire County Council (several hundred are likely to lose their jobs this year), 2,876 earn less than the living wage, and 2,583 of those are women (figures provided by the council under a freedom of information request).
Perhaps Mark Fisher should stick to Neath Port Talbot.
Owen Smith also seems to be less than well informed about Carmarthenshire. "700 disabled hit by Bedroom Tax", he tweeted, referring to the number of council tenants affected by this punitive measure.
"More reasons to vote Labour in 2015", replied Mark Fisher, presumably unaware that Kevin Madge and Tegwen Devichand had also vetoed proposals to stop victims of the bedroom tax from being evicted.
Labour's problem in Carmarthenshire is that it has to rely on outside help because of dwindling numbers. It is not clear whether any of Calum's fellow Labour councillors took part in this mini campaign. Perhaps not even Kevin Madge has the neck to campaign in favour of introducing a living wage and protecting victims of the bedroom tax from eviction, while doing the opposite in Carmarthenshire.
In preparation for its day of action, Labour put out contact details on its website (here) under the heading "Wales - Cost of Cameron Day".
One telephone number was available for anyone seeking information in Carmarthen East and Dinefwr or Carmarthen West and South Pembrokeshire: 07872417241.
It turns out that whoever has this number is located somewhere in darkest England. The same number was also used for an "action line" in support of the Labour candidate in the Corby and East Northamptonshire by-election, and it is also given as the number to call if you want to speak to the Great Yarmouth Labour Party.
Calum knows all about bussing in supporters from his own election campaign in 2012. Prominent in his team was Lee Jameson, prospective parliamentary candidate for St Austell and Newquay in Cornwall. Lee does not live in Cornwall either, it seems, but gives an address in West Sussex. At least it's in the same country!
The 2012 campaign in Tycroes was an emotional affair according to Lee's blog. Here he is writing about the count:
"So with all the votes counted and the piles separated we could see we had won, god I have never been so received we did a jig had a big hug and it would not be a true drama if I had not cried. The majority was 65 so my calculation of 150 did not look so bad and if all our promises had turned out that would have been the majority.
"We then headed of down to the pub for lunch a couple of drinks to celebrate. During that lunch the new Councillor Higgins said he could not have done it without me, and that I tell you meant a lot to me he also stated that when I decide to run I will have his full support.
That's local government politics for you.