The senate president Abubakar Bukola Saraki came third with a distant 317 votes.
The successful PDP candidate will represent the party at the 2019 presidential elections and will be slugging it out with President Muhammadu Buhari of the ruling All Progressives Congress (APC).
GARNERING a total of 68 per cent of all votes cast in a just-concluded online poll, Ibrahim Dankwambo has defeated other members of the People's Democratic Party slugging it out for the party's presidential ticket. We will not lose the momentum but sustain it to rebuild Nigeria and elect Alhaji Atiku Abubakar as the next President of Nigeria.
It said the PDP nomination would be a tight race between Abubakar and Tambuwal.
But he has been dogged by controversies over his numerous wives and more than 20 children as well as corruption allegations.
Not even the challenge of infrastructure, not the bloodletting we are witnessing in different parts of Nigeria from Zamfara, down to the middle-belt states of Taraba, Benue, Plateau, Southern Kaduna, Adamawa and the rest and sundry acts of kidnapping across this country.More news: Senate near Kavanaugh approval after epic struggle
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Dubbed "Baba Go Slow" because he took six months to appoint Cabinet ministers, he has also faced attacks for his handling of the economy, which plunged into recession in 2016.
They also pledged to support whoever emerged as the party's flagbearer.
Speaker of the House of Representatives, Hon Yakubu Dogara expressed confidence former Vice President, Atiku Abubakar to provide the right leadership that would revive Nigeria and stimulate growth.
Nigerian law allows for a president to serve a maximum of two four-year terms.
Buhari, in a speech to mark the anniversary of Nigeria's independence on October 1, sought to reassure voters that next year's elections would be free and fair after the PDP and worldwide observers raised concerns over the way a gubernatorial vote in the southwestern state of Osun was conducted.