Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_13643320_2 (gtp_winning_team VARCHAR, circuit VARCHAR, gtu_winning_team VARCHAR)
### Question:
What was the GTP winning team in the round in Portland during which Jack Baldwin become part of the GTU winning team? 
### Answer:
SELECT gtp_winning_team FROM table_13643320_2 WHERE circuit = "Portland" AND gtu_winning_team = "Jack Baldwin"