Doesn't refer to a news tip in this case. They mean tip the same way they might mean "tapped" here. Danzig is one of the names they're going to send up the flagpole for a position as either the NSA or an undersecretary of some kind in the national security office IF Obama is elected. They're already beginning to vet some of those potential advisors and get them out in front of the public this far in advance with the messaging they want them to be spouting (hence the easy to understand metaphor about why there needs to be a new tact taken w/ the war). The same committee is also working on potential cabinet appointments. If it sounds presumptive and premature, just know that McCain's team is doing the exact same thing. This stuff starts once the candidates for the general election are identified.

Got this information earlier this evening from someone with the national DNC communications office. I am donating some pro bono communications time to the state office here in Texas, and so I asked a national contact about Danzig two days ago when this story first came up. He emailed me back an answer tonight.