if you can do american beauty well then its possible... sorry for the zen sounding way that phrase came out.
if my memory is correct...
well, since powerplay explores the extent that power resides with the people, u could say that its an exploration of the 'common' people- those who aren't usually recognised to have any kind of 'power', which then subverts the traditional image of powerplay as ooo big people moving in political / big sphere whose every decision etc. will have impacts upon entire world etc. etc. instead, mendes focuses on suburbia and mundane everyday stuff...
also, as in the module you're meant to explore the nature of politics- well, there's the sexual politics involved with um.. i forget character's names... but how each one reacts to their sexuality... the creepy relationship between kevin spacey and his daughter's best friend- i.e. who has the power? spacey guy because he's older, male, 'adult', experienced or the girl because she is able to wrap him around her finger, make him change how he acts without realising? also the homosexuality of umm... that other guy's dad... i really have to remember ppls names. so nature of politics to be cosntantly shifting, constantly reconfiguring its outward appearance etc. gender too.
portrayal's of the powerful- who's powerful? the real estate guy, but subverted during sex scene where he's revealed to be massively egotistical and giving in to animal desires etc.
apologies for massive chunk of (probably crappy) analysis... i reckon you could do american beauty and do it well. itd be an interesting text as well because it explores similar ideas within antony and cleo (if that's what your doing) but in different ways. also different medium i.e. film so you'd have to talk about different techniques which is excellant. i wish i was doing this now! but i already have a visual text...
um question: is there any constraints on what types of related texts you can choose? because my school specifies that if your prescribed text isn't a visual one i.e. frontline (im just using as an example, im avctually doing pwoerplay) then you have to have at least ONE of your r elated texts as a visual... is it bad if i have two visual texts i.e. tv show and film?