I see a constraint in my table thats not in INFORMATION SCHEMA?
Please stop using INFORMATION_SCHEMA and deprecated backward compatibility views like sysobjects. This is just another in the long list of things that INFORMATION_SCHEMA is missing in order to provide a complete picture of your metadata. See this post for a more exhaustive list:


The case against INFORMATION_SCHEMA views


To find the name of the default constraints for any table, use the catalog view sys.default_constraints:

SELECT [constraint] = df.name, [column] = c.name, df.[definition]
  FROM sys.default_constraints AS df
  INNER JOIN sys.tables AS t
    ON df.parent_object_id = t.[object_id]
  INNER JOIN sys.columns AS c
    ON t.[object_id] = c.[object_id]
    AND df.parent_column_id = c.column_id
  INNER JOIN sys.schemas AS s
    ON s.[schema_id] = t.[schema_id]
  WHERE s.name = N'dbo'
  AND t.name = N'DocumentDistribution';