What type of political party Sherrod Brown has in 2005?
political party refers to party; Sherrod Brown is an official_full_name; official_full_name refers to first_name, last_name; 2005 refers to start = 2005
SELECT T1.party FROM `current-terms` AS T1 INNER JOIN current AS T2 ON T2.bioguide_id = T1.bioguide WHERE T2.first_name = 'Sherrod' AND T2.last_name = 'Brown' AND T1.start LIKE '%2005%'