In the cases where you can't rely on that happening, then that means no one else gives a damn about what you are doing. This would be very odd in a multi-tiered organization, since often times development projects are decreed onto the programming staff by strategic direction committees. If no one cares, the project is make-work; warning. Either it is going to contribute next to no value to the organization, or no one has a clue what value it is going to contribute. Either way, you'll be hard pressed to convince everyone who needs to be convinced what you are doing is that valuable.

To borrow a PG idea, to everyone above you in the management hierarchy, you are represented -- as an aggregate of the rest of your group -- by either your lead or manager. A lot of the interaction between your group and the rest of the company will be done by them. They need to be your advocate; if they're not doing that, then your entire group is getting shafted, and need to find a better advocate.