Sanjrani, an independent, had been backed by Pakistan Peoples Party (PPP), Pakistan Tehreek-e-Insaf (PTI) and the Muttahida Qaumi Movement-Pakistan (MQM-P).
With the ruling party claiming to have gathered the support of as many as 57 senators in the 104-House to elect its candidates easily, Sharif and his allies chose to support Raza Rabbani, if PPP nominates him for the office of Senate chairman.
Mohammad Sadiq Sanjrani, who hails from the southwestern Balochistan province, and is a candidate of the joint opposition, secured 57 out of a total of 103 votes, while his rival, Raja Zafar-ul-Haq, of the Pakistan Muslim League (Nawaz group) won 46 votes on Monday.
After the recent Senate elections, the Bizenjo-led group of independent senators-elect from Balochistan raised the demand that the top office of Senate be given to the province.
"The face of this house is blackened today", said Mir Hasil Bizenjo, a government minister and ally of former prime minister Nawaz Sharif who was ousted by a Supreme Court ruling last July that his party suggested was influenced by the powerful military.
The opposition parties - PPP and PTI - have vowed support to Saleem Mandviwalla as the deputy chairman.
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The election for the Chairman Senate and the Deputy Chairman Senate will take place at 4:00 pm today in the Upper House of the Parliament in Islamabad.
"After the building has been collapsed, it is being said we have done it for Balochistan".
The ruling PML-N and allies after final consultation in the morning nominated veteran politician from Rawalpindi, Senator Raja Zafarul Haq, as chairman and Usman Kakar from Balochistan as deputy chairman, according PML-N Senator Mushahidullah Khan. And, the party leaders are making hectic efforts to win over the support of smaller parties and independents to achieve the figure of 53, the magic number required to clinch the top Senate slots. The first had been the swearing in of Senator Krishna Kohli earlier in the day, Dawn news reported. Senators were then invited to sign the member rolls.
Talking to the media after the meeting, NP chief Bizenjo, who holds the portfolio of Federal Minister for Maritime Affairs, said that the ruling coalition has empowered Nawaz to decide the candidates for both chairman and deputy chairman slots and the announcement would most likely be made today (Sunday).
Half of the senators are elected for six years, and half for three years. The chairman represents both the opposition and treasury benches.
PML-N Central Information Secretary Mushahid Ullah said they have managed to get simple majority in the 104-member House but they were still trying to woo more votes.