One reason we argued yesterday that Mary Landrieu ought to retire from her race against Bill Cassidy was that she won’t have access to the big national money from the Democrats for the runoff now that control of the Senate has already passed to the GOP.

Now we see that contention was correct, as POLITICO reports Landrieu just lost a major TV buy from the Democratic Senatorial Campaign Committee, which spent $4.1 million for her in the primary…

The committee canceled buys planned from Monday through December 6 in the Lafayette, Baton Rouge and New Orleans markets, three sources tracking the air war told POLITICO.

With control of the Senate no longer on the line, the race becomes less important for both party committees – which each took out loans in the final weeks before Tuesday’s election.

“Mary Landrieu is a proven run-off winner and we support her 100 percent,” said DSCC spokesman Justin Barasky. “We are going to make ongoing determinations on how best to invest in the race. We made the initial reservation when there were concerns that the rates would skyrocket but they have stabilized, giving us more flexibility to make week-to-week decisions.”

Sure, the DSCC might bring the cash back in. But if their plan was to keep or intensify the amount of air time they’d previously committed to, the chances are that none of that media would be canceled.

But while Landrieu’s air force seems like it’s shrinking, Cassidy’s is growing. If you remember Landrieu’s reference to the evil Koch Brothers in her “victory” speech on Tuesday, one reason for such a conspicuous sniping is that Freedom Partners, the Kochs’ political umbrella organization, has been running ads against her already.

A group affiliated with conservative mega-donors the Koch brothers is spending $2.1 million in ads against Sen. Mary Landrieu (D-La.) in her runoff against Rep. Bill Cassidy (R).

Freedom Partners Action Fund wasted no time after news outlets projected that Landrieu and Cassidy were headed to a runoff after Cassidy won a plurality but neither won a majority on election night, hitting the Democratic incumbent.

The Freedom Partners ad is everywhere on the air today. Here it is in case you haven’t seen it…

There have been estimates of some $10 million in planned ad buys against Landrieu by Republican groups like the National Rifle Association, Crossroads GPS, the National Republican Senatorial Committee and a few others for the runoff, and to date we haven’t heard any plans for those to be cut or canceled.

The Democrats’ money has been cut, though.

In the primary, some $17 million was spent by outside groups on the Cassidy-Landrieu race. Of that, $10.2 million was spent attacking Cassidy and $5.3 million spent attacking Landrieu.