CREATE TABLE table_855 ("Rnd" FLOAT, "Circuit" TEXT, "GTP Winning Team" TEXT, "GTO Winning Team" TEXT, "GTU Winning Team" TEXT, "Results" TEXT)

What was the GTP winning team in the round in Portland during which Jack Baldwin become part of the GTU winning team?
SELECT "GTP Winning Team" FROM table_855 WHERE "Circuit" = 'Portland' AND "GTU Winning Team" = 'Jack Baldwin'
SELECT "GTP Winning Team" FROM "table_855" WHERE "Circuit" = 'Portland' AND "GTU Winning Team" = 'Jack Baldwin'