Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Rnd | Circuit | GTP Winning Team | GTO Winning Team | GTU Winning Team | Results |
| --- | --- | --- | --- | --- | --- |
| 1.0 | Daytona | #00 Kreepy Krauly Racing | #4 Stratagraph Inc. | #76 Malibu Grand Prix | Results |
| 1.0 | Daytona | Sarel van der Merwe Graham Duxbury Tony Martin | Terry Labonte Billy Hagan Gene Felton | Jack Baldwin Jim Cook Ira Young Bob Reed | Results |
| 2.0 | Miami | #04 Group 44 | #47 Dingman Bros. Racing | #99 All American Racers | Results |
| 2.0 | Miami | Doc Bundy Brian Redman | Walt Bohren | Chris Cord | Results |
| 3.0 | Sebring | #48 DeNarvaez Enterprises | #4 Stratagraph Inc. | #76 Malibu Grand Prix | Results |
| 3.0 | Sebring | Mauricio DeNarvaez Hans Heyer Stefan Johansson | Terry Labonte Billy Hagan Gene Felton | Jack Baldwin Bob Reed Ira Young | Results |
| 4.0 | Road Atlanta | #16 Marty Hinze Racing | #4 Stratagraph Inc. | #76 Malibu Grand Prix | Results |
| 4.0 | Road Atlanta | Don Whittington | Billy Hagan Gene Felton | Jack Baldwin Bob Reed | Results |
| 5.0 | Riverside | #56 Blue Thunder Racing | #38 Mandeville Auto Tech | #87 Performance Motorsports | Results |
| 5.0 | Riverside | Don Whittington Randy Lanier | Roger Mandeville Amos Johnson | Elliot Forbes-Robinson John Schneider | Results |
| 6.0 | Laguna Seca | #56 Blue Thunder Racing | #77 Brooks Racing | #99 All American Racers | Results |
| 6.0 | Laguna Seca | Randy Lanier | John Bauer | Jim Adams | Results |
| 7.0 | Charlotte | #56 Blue Thunder Racing | #4 Stratagraph Inc. | #99 All American Racers | Results |
| 7.0 | Charlotte | Bill Whittington Randy Lanier | Billy Hagan Gene Felton | Chris Cord Jim Adams | Results |
| 8.0 | Lime Rock | #00 Kreepy Krauly Racing | #38 Mandeville Auto Tech | #76 Malibu Grand Prix | Results |
| 8.0 | Lime Rock | Sarel van der Merwe | Roger Mandeville | Jack Baldwin | Results |
| 9.0 | Mid-Ohio | #14 Holbert Racing | #91 Electrodyne | #66 Mike Meyer Racing | Results |
| 9.0 | Mid-Ohio | Al Holbert Derek Bell | Chester Vincentz Dave White | Jack Dunham Jeff Kline | Results |
| 10.0 | Watkins Glen | #14 Holbert Racing | #91 Electrodyne | #87 Performance Motorsports | Results |
| 10.0 | Watkins Glen | Al Holbert Jim Adams Derek Bell | Chester Vincentz Jim Mullen | Elliot Forbes-Robinson John Schneider | Results |
| 11.0 | Portland | #56 Blue Thunder Racing | #51 Corvette | #76 Malibu Grand Prix | Results |
| 11.0 | Portland | Bill Whittington Randy Lanier | David Schroeder Tom Hendrickson | Jack Baldwin | Results |
| 12.0 | Sears Point | #56 Blue Thunder Racing | #77 Brooks Racing | #98 All American Racers | Results |
| 12.0 | Sears Point | Bill Whittington | John Bauer | Dennis Aase | Results |
| 13.0 | Road America | #14 Holbert Racing | #91 Electrodyne | #66 Mike Meyer Racing | Results |
| 13.0 | Road America | Al Holbert Derek Bell | Chester Vincentz Jim Mullen | Jack Dunham Jeff Kline | Results |
| 14.0 | Pocono | #14 Holbert Racing | #65 English Enterprises | #87 Performance Motorsports | Results |
| 14.0 | Pocono | Al Holbert Derek Bell | Gene Felton | Elliot Forbes-Robinson John Schneider | Results |
| 15.0 | Michigan | #56 Blue Thunder Racing | #91 Electrodyne | #84 Dole Racing | Results |
| 15.0 | Michigan | Bill Whittington Randy Lanier | Chester Vincentz Jim Mullen | Clay Young | Results |
| 16.0 | Watkins Glen | #57 Blue Thunder Racing | #91 Electrodyne | #84 Dole Racing | Results |
| 16.0 | Watkins Glen | Dale Whittington Randy Lanier | Chester Vincentz Jim Mullen | Clay Young | Results |
| 17.0 | Daytona | #14 Holbert Racing | #67 Roush Racing | #87 Performance Motorsports | Results |
Question:
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