Here are a few to consider:
Ending corporate personhood (for details, see for example the civic organizing website www.movetoamend.org , and Jeffrey Clements' upcoming book -- http://jeff-clements.com/author/jeffclements/ ).
Restoring campaign finance reform (see for example Lawrence Lessig's just-published book -- http://www.amazon.com/Republic-Lost-Money-Corrupts-Congress--/dp/0446576433/ref=s…