OK, I have some working code. Couple of points:
1. I used httpcomponents-client-4.1 from Apache (http://hc.apache.org/downloads.cgi, and select the 4.1 GA zip).
2. I made some small changes to how the HttpHost and HttpGet objects are constructed:
HttpHost targetHost = new HttpHost("api.constantcontact.com", -1, "https");
HttpGet httpget = new HttpGet("/ws/customers/USERNAME/campaigns");
(Note, this uses the 3 param constructor for HttpHost - there is no 2 paramter String,String version available in the httpcomponents library that I used).
Please repost when you have a chance to try this - and hope this helps.
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