You know they're staying up all night every night trying to find something with traction against Trump.
This may be the setup for that. If they see this damage Rubio, they'll go after Trump's multiple divorces.
The problem is that voters probably don't care about this and the Trumpkins won't care what Donald may or may not have done, either. Besides, if you take down Rubio and then Trump, who stands atop the field?
The answer is Cruz. And that, the Democrats find extremely scary.