mandatory (adj): Obligatory; required or commanded by authority.
As the article points out, most of this is going to mandatory programs, which would be the same even if it were Romney or McCain or Sarah Fucking Palin in office.
What this means, for those dumb enough to believe what they read in IBD, is that what Obama has achieved is to reduce the amount of spending on the discretionary side. Agriculture, down 8%. HHS, down 7.6%. Even Homeland Security, down 2.8%. The Pentagon is down over $100 billion.
But hey, by all means, let's make sure that this looks like Obama's doing a bad job, because that was clearly the author's goal before he wrote it. The rest is just a matter of selecting the data until it proves what you wanted it to prove.
When we hear a serious discussion of how to cut benefits (something other than "the poor should die" and "let's give it all to Wall Street, because they're so freaking responsible"), we can have an actual conversation. But articles like this show why anything from Obama, no matter how reasonable, is doomed even before it gets printed.