Massie outlines Clegg's duties:
The single most important thing in this government is the relationship - and level of trust - between Cameron and Clegg ... Clegg's role, in some ways, might be compared to that of a ship's Master. Yes, the Captain is in command of everything and has the final say but he depends heavily upon the Master to ensure that the ship sails properly and reaches its rightful destination. On a huge range of issues, then, Clegg is likely to be responsible for ensuring that agreements are met, policy co-ordinated and everyone kept happy. That's actually a pretty hefty job.
And how would that differ from the role Brown performed for Blair for so long? I guess the answer is that Clegg is likely to be more loyal.