Karen Cartwright imagines herself in a shimmering white dress, center stage, belting out that ultimate dreamer’s song, “Somewhere Over the Rainbow.” She stretches her hands above her head, ever so dramatically, because she’s really into this performance – she isn’t just singing these words, she’s feeling them. She closes her eyes. Oh, yeah. She’s all up inside this song and we immediately understand the subtext here: these lyrics have been etched into her heart since she was a small girl, head already full of big city hopes and dreams about makin’ it. A cell phone rings, jolting Karen back to reality. She’s in a small room – far from the spotlight- auditioning for some jaded folks who somehow can’t see that she’s from Iowa and that she has aspirations! How wide-eyed does a girl have to be before someone gives her a leading role in a Broadway musical, yo? American Idol is all about regular people with unexpected talent, yearning for stardom. (Well, it used to be. Now, according to the most recent promos, it’s all about kids falling off of stages.) Katherine McPhee is an American Idol runner-up, so I guess she’s suited for this Karen part on Smash, NBC’s much-hyped drama about the creation of a musical based on the life of Marilyn Monroe. McPhee’s Karen has a fresh-faced charm about her, the kind of girl you’d maybe instinctively root for, and the character’s Midwestern origins are, I believe, supposed to make her that much more appealing. The