One of the reasons for BN's poor performance during the 12th General Election was Dr Mahathir. He was fighting with Abdullah Ahmad Badawi, who had aides who thought they were big enough to take the statesman down. The Opposition only had to ride on Dr Mahathir's wrath into March 2008. The rest is history.
Come PRU13, Dr Mahathir won't be out to take down a Prime Minister. In fact, I hear he's agreed to help Najib to campaign in two states, states that fell to Pakatan Rakyat partly because of the BN infighting, sleepwalking and arrogance back then.
So, it's going to be a little different this time around.