[Table] header: Rnd | Circuit | GTP Winning Team | GTO Winning Team | GTU Winning Team | Results row 1 : 1 | Daytona | #00 Kreepy Krauly Racing | #4 Stratagraph Inc. | #76 Malibu Grand Prix | Results
row 2 : 1 | Daytona | Sarel van der Merwe Graham Dux | Terry Labonte Billy Hagan Gene Felton | Jack Baldwin Jim Cook Ira Young Bob Reed | Results
row 3 : 2 | Miami | #04 Group 44 | #47 Dingman Bros. Racing | #99 All American Racers | Results
row 4 : 2 | Miami | Doc Bundy Brian Redman | Walt Bohren | Chris Cord | Results
row 5 : 3 | Sebring | #48 DeNarvaez Enterprises | #4 Stratagraph Inc. | #76 Malibu Grand Prix | Results
row 6 : 3 | Sebring | Mauricio DeNarvaez Hans | Terry Labonte Billy Hagan Gene Felton | Jack Baldwin Bob Reed Ira Young | Results
row 7 : 4 | Road Atlanta | #16 Marty Hinze Racing | #4 Stratagraph Inc. | #76 Malibu Grand Prix | Results
row 8 : 4 | Road Atlanta | Don Whittington | Billy Hagan Gene Felton | Jack Baldwin Bob Reed | Results
row 9 : 5 | Riverside | #56 Blue Thunder Racing | #38 Mandeville Auto Tech | #87 Performance Motorsports | Results
row 10 : 5 | Riverside | Don Whittington Randy Lanier | Roger Mandeville Amos Johnson | Elliot Forbes-Robinson John | Results
row 11 : 6 | Laguna Seca | #56 Blue Thunder Racing | #77 Brooks Racing | #99 All American Racers | Results
row 12 : 6 | Laguna Seca | Randy Lanier | John Bauer | Jim Adams | Results
row 13 : 7 | Charlotte | #56 Blue Thunder Racing | #4 Stratagraph Inc. | #99 All American Racers | Results
row 14 : 7 | Charlotte | Bill Whittington Randy Lanier | Billy Hagan Gene Felton | Chris Cord Jim Adams | Results
row 15 : 8 | Lime Rock | #00 Kreepy Krauly Racing | #38 Mandeville Auto Tech | #76 Malibu Grand Prix | Results
row 16 : 8 | Lime Rock | Sarel van der Merwe | Roger Mandeville | Jack Baldwin | Results
row 17 : 9 | Mid-Ohio | #14 Holbert Racing | #91 Electrodyne | #66 Mike Meyer Racing | Results
row 18 : 9 | Mid-Ohio | Al Holbert Derek Bell | Chester Vincentz Dave White | Jack Dunham Jeff Kline | Results
row 19 : 10 | Watkins Glen | #14 Holbert Racing | #91 Electrodyne | #87 Performance Motorsports | Results
row 20 : 10 | Watkins Glen | Al Holbert Jim Adams Derek Bell | Chester Vincentz Jim Mullen | Elliot Forbes-Robinson John | Results
row 21 : 11 | Portland | #56 Blue Thunder Racing | #51 Corvette | #76 Malibu Grand Prix | Results
row 22 : 11 | Portland | Bill Whittington Randy Lanier | David Schroeder Tom Hendrickson | Jack Baldwin | Results
row 23 : 12 | Sears Point | #56 Blue Thunder Racing | #77 Brooks Racing | #98 All American Racers | Results
row 24 : 12 | Sears Point | Bill Whittington | John Bauer | Dennis Aase | Results
row 25 : 13 | Road America | #14 Holbert Racing | #91 Electrodyne | #66 Mike Meyer Racing | Results
row 26 : 13 | Road America | Al Holbert Derek Bell | Chester Vincentz Jim Mullen | Jack Dunham Jeff Kline | Results
row 27 : 14 | Pocono | #14 Holbert Racing | #65 English Enterprises | #87 Performance Motorsports | Results
row 28 : 14 | Pocono | Al Holbert Derek Bell | Gene Felton | Elliot Forbes-Robinson John | Results
row 29 : 15 | Michigan | #56 Blue Thunder Racing | #91 Electrodyne | #84 Dole Racing | Results
row 30 : 15 | Michigan | Bill Whittington Randy Lanier | Chester Vincentz Jim Mullen | Clay Young | Results
row 31 : 16 | Watkins Glen | #57 Blue Thunder Racing | #91 Electrodyne | #84 Dole Racing | Results
row 32 : 16 | Watkins Glen | Dale Whittington Randy Lanier | Chester Vincentz Jim Mullen | Clay Young | Results
row 33 : 17 | Daytona | #14 Holbert Racing | #67 Roush Racing | #87 Performance Motorsports | Results [/Table] Answer this question based on the above table: What was the GTP winning team in the round in Portland during which Jack Baldwin become part of the GTU winning team? 

Answer: Bill Whittington Randy Lanier