This is the reason Why Obasanjo picked Jonathan as Yar"Adua's running mate - Alamiyeseigha

Former Bayelsa state governor, Diepreye
Alamieyeseigha, says former President Obasanjo picked
Goodluck Jonathan as the running mate of late President
YarAdua in the 2007 election because he, Obasanjo, wanted
to stop former VP Atiku Abubakar from running for
president. Alamiyeseigha reportedly said this while speaking
to journalist at his home in Yenagoa, the Bayelsa state
capital.

"For Goodluck, I knew that Jonathan was going
to be vice president of Nigeria as far back as
August 25, 2005. Former President, Olusegun
Obasanjo, told me that since Atiku and I wanted
to take his job, that it would be over his dead body;
and that unless he died, Atiku cannot be president of
Nigeria. Obasanjo said since Atiku had picked me
as his running mate, he would make sure that he
dealt with and disgraced us. He said he was going
to use my deputy to rubbish me before everybody.
So, I knew.” he said