In the Conservative leadership election in 2005, David Cameron won 28.3% of MPs votes in the first round, and 45.5% in the second - Which compares badly with the 46.6% of Labour MPs & MEPs that EM won.
He won in the 3rd ballot, when the majority of party members preferred him to David Davis.
As for the other half of the brokeback coalition, his result against Chris Huhne was almost exactly the same as the percentage split between Ed and David Milliband. ( Although there is apparently some credence to the claim that Huhne would have won had a large number of his votes not been delayed by the Christmas post ).