When was it blooming and where was it photographed? Do you have other pictures of it not so close up?

Astragalus sp.?

Here is a link that might be useful: Astragalus

Viccia cracca or similar is probably more likely in the East Coast area.

Here is a link that might be useful: Viccia cracca

Yes a vetch (Viccia) is what came to my mind as well.

Thanks so much! Vetch, or Viccia, is I think the name I'm looking for.

Note that you have two separate plants in the picture: a Campanula of some species and the Tufted Vetch (Viccia cracca)