Pakistan's presidential hopefuls began a final push for support Friday on the eve of an election that slain opposition leader Benazir Bhutto's widower is expected to win. Asif Ali Zardari is the frontrunner in a three-way race to take power in a country riven by Islamic militancy and economic turmoil. Security will be raised on election day, officials have said, and Zardari has already moved house due to fears of attempts being made on his life, just nine months after Bhutto was killed at a campaign rally. Tensions rose further after a failed assassination attempt on Prime Minister Yousuf Raza Gilani, whose car was hit by sniper fire on Wednesday as it drove to meet him at an airport. Zardari will face a multitude of problems if he wins a secret ballot among lawmakers and takes charge of a nuclear-armed state where bombings and suicide attacks have killed nearly 1,200 people in the past year. Pakistan's economy is backsliding with inflation rampant and a volatile political situation contributing to a 40 percent fall on the stock market since January, in a country already reliant on foreign aid. The unrest that has struck the nation has been attributed to militants angry at former president Pervez Musharraf's support for the United States and its "war on terror." As co-chairman of the Pakistan People's Party (PPP), Zardari already heads a fragile coalition government which, although still in office, recently lost the backing of two-time former premier Nawaz Sharif's party. A PPP aide said that Zardari would Friday meet parliamentarians and his own party officials to finalise strategy for election day."Inshallah (God willing) he will win and secure 500 of the 700 votes of the electoral college," the aide said, referring to the Senate, National Assembly and four provincial assemblies that will choose Pakistan's president. Zardari is being challenged by retired chief justice Saeed-uz-Zaman Siddiqui, who is backed by former premier Sharif, and Mushahid Hussain, a close aide of Musharraf. Sharif's spokesman alleged Friday that Zardari was indulging in unfair tactics ahead of the vote."There is a general impression that the PPP is using state resources in the campaign for presidential elections," said PML-N spokesman Siddiqul Farooq. "We are all for fair play and will not indulge in foul play, nor do we like others to adopt any undemocratic tactics." Voting will start at 10:00 am (0400 GMT) and closes at 3:00 pm. A result is expected later Saturday evening.