The SAG cast win came a day after Argo claimed the top honor from the Producers Guild of America, whose winner often goes on to claim best picture at the Academy Awards. Argo also was a surprise victor two weeks ago at the Golden Globes, where it won best drama and director for Ben Affleck.
The awards momentum positions Argo for a rare feat at the Feb. 24 Oscars, where it could become just the fourth film in 85 years to be named best picture without a nomination for its director.
"To me this has nothing to do with me, it has to do with the incredible people who were in this movie," said Affleck, who also stars in Argo and accepted the SAG prize alongside his cast.
In picture: Ben Affleck accepts the award for outstanding cast in a motion picture for Argo.
Text and images: AP