Cameron has offered negotiations, which hasn't ruled out cabinet seats for Lib Dems - more than just "confidence and supply", which is the most basic form of minority government.
http://news.bbc.co.uk/1/hi/uk_politics/election_2010/8667938.stmOn voting, he offered an "all party committee of inquiry on political and electoral reform". I think Clegg should say that's not enough - it has to be a referendum. Brown has explicitly offered a referendum:
"The first is the plan to ensure continuing economic stability, where there is substantial common ground, and the plan to carry through far-reaching political reforms, including changes to the voting system.
"Both of us have made clear our commitment to this in our manifestos and the electorate has sent us a very strong message which must be heard.
"My view is clear, there needs to be immediate legislation on this to begin to restore the public trust in politics and to improve Parliament's standing and reputation, a fairer voting system is central.
"And I believe that you the British people should be able to decide in a referendum what the system should be.
http://www.belfasttelegraph.co.uk/news/politics/election/gordon-browns-statement-in-full-14799249.htmlI hope Clegg demands the referendum from Cameron, and if he refuses, then go to Brown.