Presidential Yard Sign Contest

A few days ago I posed a question to a runner, "How many Obama signs do you think are on your running route?"  The answer: 30, possibly 31, on a 4 mile Fancy/Miller/CD run.  Some micro-analysis proved to be more interesting, though, since a few blocks had more concentrated yard signage than others.  This made me wonder: "Which 1 block stretch on Capitol Hill has the highest number of visible Obama signs?" 

A few rules:

• The sign can be in the yard, in a window, etc, but it must be visible from the sidewalk.
• Bumper stickers on cars don't count.
• Multiple signs at a single dwelling unit count separately.

So CHSers, which block is it?

(To be fair, we can use these same rules to ask: "Does any 1 block stretch of Capitol Hill have a McCain sign?")