diff --git a/pscl/ext/__init__.py b/pscl/ext/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/pscl/ext/openstates.py b/pscl/ext/openstates.py
new file mode 100644
index 0000000..17feb04
--- /dev/null
+++ b/pscl/ext/openstates.py
@@ -0,0 +1,73 @@
+import logging
+from collections import defaultdict
+
+from pscl import Rollcall
+from pandas import DataFrame
+
+
+class RollcallBuilder(object):
+    '''Provides an easy(ish) way to build a rollcall object from
+    the Open States API.
+    '''
+    def __init__(self, valid_ids, YES=1, NO=2, OTHER=3, NA=9):
+        self.votedata = defaultdict(dict)
+        self.YES = float(YES)
+        self.NO = float(NO)
+        self.OTHER = float(OTHER)
+        self.NA = float(NA)
+        self.vote_vals = dict(
+            yes_votes=self.YES,
+            no_votes=self.NO,
+            other_votes=self.OTHER)
+        self.valid_ids = valid_ids
+        self.leg_ids = set()
+
+    def add_vote(self, vote):
+        vote_keys = 'yes_votes, no_votes, other_votes'.split(', ')
+        valid_ids = self.valid_ids
+        vote_vals = self.vote_vals
+        leg_ids = self.leg_ids
+        for k in vote_keys:
+            for voter in vote[k]:
+                leg_id = voter['leg_id']
+                if leg_id is None:
+                    continue
+                if leg_id not in valid_ids:
+                    continue
+                leg_ids.add(leg_id)
+                self.votedata[vote['id']][leg_id] = vote_vals[k]
+
+    def get_rollcall(self):
+        # Convert the dict into a pandas DataFrame.
+        dataframe = DataFrame(self.votedata, index=self.leg_ids)
+        dataframe.fillna(value=self.NA)
+
+        # Create a rollcall object similar to pscl's.
+        rollcall = Rollcall.from_dataframe(dataframe,
+            yea=[self.YES],
+            nay=[self.NO],
+            missing=[self.OTHER],
+            not_in_legis=0.0,
+            legis_names=tuple(self.leg_ids))
+
+        return rollcall
+
+
+if __name__ == '__main__':
+    from sunlight import openstates, cache
+    cache.enable('mongo')
+    cache.logger.setLevel(10)
+
+    spec = dict(state='al', chamber='lower', search_window='term:2011-2014')
+    valid_ids = [leg['id'] for leg in openstates.legislators(**spec)]
+    builder = RollcallBuilder(valid_ids)
+    bills = openstates.bills(**spec)
+    for bill in bills:
+        bill = openstates.bill(bill['id'])
+        for vote in bill['votes']:
+            if vote['chamber'] != bill['chamber']:
+                continue
+            builder.add_vote(vote)
+
+    rollcall = builder.get_rollcall()
+    import pdb; pdb.set_trace()