Original sentence: In April 2011, to the distress of Labour colleagues,he succesfully campaigned with the Conservative Prime Minister, David Cameron, and others against changes to voting.On 10 May 2010 Reid argued on BBC television that David Cameron should become the next Prime Minister in the interests of honouring the democratic wishes of the British people with the Conservative Party having received more votes than any other party - even though had Labour and the Liberal Democrats formed an alliance, their combined votes would outnumber Conservative ones at the 2010 General Election - stating that a Labour / Liberal Democrat alliance would still not form a parliamentary majority
Edited sentence: In April 2011, to the distress of Labour colleagues,he campaigned with vigour with the Conservative Prime Minister, David Cameron against the voting reform.On 10 May 2010 Reid argued on BBC television that David Cameron should become the next Prime Minister in the interests of honouring the democratic wishes of the British people - this in spite of the fact that, had Labour and the Liberal Democrats formed an alliance, their combined votes comfortably outnumbered Conservative ones at the 2010 General Election - stating that this still did not form a parliamentary majority.Something that he and David Cameron successfully achieved