Last week, First Read noted how Republican Rick Scott and allies are outspending Sen. Bill Nelson and the Democrats over TV and radio airwaves by nearly a 50-to-1 margin in ads.

And since we published that, the margin has increased to 66 to 1, $12.3 million to $185,000.

Well, Senate Majority PAC, the Dems’ main Senate Super PAC, is now advertising on Nelson’s behalf with a new TV ad. Senate Majority PAC tells NBC News that the buy is $2.2 million.

“Bill Nelson has delivered for Florida,” the narrator says in the ad. “When some tried to privatize Social Security and Medicare for millions of Floridians, he stopped them. Stopped insurance companies from denying coverage for pre-existing conditions too. We need a senator who serves all of us. Who puts Florida first. That’s Bill Nelson.”

Rick Scott's campaign responded in a statement, saying that "it's ironic that a liberal SuperPAC is going out of its way to claim that Bill Nelson is independent." 

"Nelson's voting record is anything but moderate and nothing can hide his own record of voting in lockstep with his party bosses in D.C. Not surprisingly, the ad focuses on things Nelson has opposed, but not a single thing he has accomplished," said Scott spokesman Ryan Patmintra.