Where did the union money go again?

HotAir helps us with the hard math:

If you want a better look at how “balanced” things are in terms of union support for Democrats and Republicans, why don’t we just look at the entity being sued in this Supreme Court case? It’s the American Federation of State, County and Municipal Employees (AFSCME). How well do they spread their money around between the two parties? For that answer, we need look no further than Open Secrets to see what proportions of the more than $10M they spent in the 2015/2016 election cycle they spent where. Let’s take a peek at their outside money spent for or against candidates in those years, shall we?

Independent Expenditures: $8,340,618
For Democrats: $2,661,233
Against Democrats: $0
For Republicans: $0
Against Republicans: $7,562,498
Electioneering Communications: $0
Communication Costs: $1,883,204

Let’s see… the total spent for Democrats or against Republicans adds up to $10,223,731. And the amount spent for Republicans or against Democrats adds up to… hang on. Let me get my calculator out here. (carry the two…. six gozinta 14…) There we go. It adds up to zero. Zilch. Nada. In more technical terms found in post-graduate math classes, that’s known as bupkis.

So would you care to explain to me once more how this is an issue which hits both parties? I’m a bit slow and wasn’t really a math major so you may have to use small words.