*Renee Zellweger will win the Oscar for playing Judy Garland, and this is another case of a movie star playing a (different) movie star. (Think of Jessica Lange as Frances Farmer, ScarJo as Janet Leigh, Nicole Kidman as Grace Kelly, Robert Downey, Jr. as Chaplin.) What IS rare is when a star-impersonates-older-star performance wins an Oscar. This happened for a supporting role in "Ed Wood"; it happened for "The Aviator." (Something in the same ballpark happened with "Ray," but Ray wasn't a movie star; Ray was a musician. Same for Witherspoon in "Walk the Line." And Spacek as Loretta Lynn.) *No one thinks that Ms. Zellweger really should get an Oscar this time around. The buzz is that the year's best performance came from Alfre Woodard, in "Clemency"; Ms. Woodard wasn't nominated. *Each year, the Times critics list their ideal nominees for the performance awards. It's striking that, in three of four cases, the...