Is This Legal? Can a Government Department Encourage Partisan Politics?

The Lou Dobbs radio show pointed out yesterday that the Health and Human Services web site had a button on it that asked for "Support for Health Reform This Year", I couldn't believe it.

Believe it!

On the right column, there is a link to healthreform.gov, clearly an advocacy site. When you navigate there, we are told:

This is an official U.S. Government Web site managed by the U.S. Department of Health & Human Services.

How can the US government be involved in unofficial advocacy?

Is this legal? I thought our government (unlike the elected politicians) had to be neutral to politicking?