What steps will reproduce the problem?
1. Run this code: http://pastie.org/798082


What is the expected output? What do you see instead?

Expected: 
{"Id":"15264398","Name":"Michael
Hoisie","Screen_name":"hoisie"}

Actual: 
{"Id":"15264398","Name":"Michael
Hoisie","Screen_name":""}

What is your $GOOS?  $GOARCH?
linux/amd64

Which revision are you using?  (hg identify)
64a75ac14385+ tip

Please provide any additional information below.
According to http://www.w3schools.com/XML/xml_elements.asp, underscores are 
a best practice, so it should work