WI: Lib Dems enter Brown Government?

What if as initially rumoured in 2007, the Lib Dems had taken up cabinet positions within the Brown Government? How would this have effect Ming Campbell's future as Leader, the economic crisis and the 2009/10 General Election?
 
For one thing, it would have made it impossible for the Lib Dems to run against the government. It would have boosted the Tories and, to a lesser extent, Labour.
 
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