Thinking about it further, perhaps David Davis winning the 2005 leadership election by a squeaker could help him here? I know this seems to vialate the idea of a Cameron-lead Tory government, but here me out-say Davis wins, but he resigns as leader of the opposition at around the same time he left the Shadow cabinet in OTL, for simelar reasons? If Brown and Clegg come in at around the same time as OTL, Davis might seem stail by then. Combine this with a disagreement in regards to the ID Bill and Davis might chuck in the towell in June 2008 (it's a stretch I know).
If this happens though, Cameron (having just lost out in 2005) would be in a strong position to become leader then. This means he'd be the newest party leader by the time the 2010 election roles around. His Leadership victory would also come at around the same time Obama mania was making it's way over here-he'd just clinched the dem nomination at this point. Cameron and Obama won't be singing from the same hymn sheet, but vague asociation with Obama amongst voters over here certainly won't hert him.
If this happens though, Cameron (having just lost out in 2005) would be in a strong position to become leader then. This means he'd be the newest party leader by the time the 2010 election roles around. His Leadership victory would also come at around the same time Obama mania was making it's way over here-he'd just clinched the dem nomination at this point. Cameron and Obama won't be singing from the same hymn sheet, but vague asociation with Obama amongst voters over here certainly won't hert him.