What was the GTP winning team in the round in Portland during which Jack Baldwin become part of the GTU winning team?
CREATE TABLE table_13643320_2 (
    gtp_winning_team VARCHAR,
    circuit VARCHAR,
    gtu_winning_team VARCHAR
)
SELECT gtp_winning_team FROM table_13643320_2 WHERE circuit = "Portland" AND gtu_winning_team = "Jack Baldwin"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What was the GTP winning team in the round in Portland during which Jack Baldwin become part of the GTU winning team? ### Input: CREATE TABLE table_13643320_2 (
    gtp_winning_team VARCHAR,
    circuit VARCHAR,
    gtu_winning_team VARCHAR
) ### Response: SELECT gtp_winning_team FROM table_13643320_2 WHERE circuit = "Portland" AND gtu_winning_team = "Jack Baldwin"