While at the time of writing there seems to be less evidence that supports his assertions than in 2007 and 2013, the murder of the head of IT at the Independent Electoral and Boundaries Commission (IEBC), and the IEBC's decision to announce unofficial results, has created doubts in the mind of voters about the integrity of this election.
Kenyan law states that electronic reporting must be double-checked and verified by physical paper forms signed by polling station officials before Kenya's Independent Electoral and Boundaries Commission, or IEBC, can declare a victor.
The opposition has continually made allegations of corrupted ballots since Monday's vote, but several worldwide monitors from a group that included former US secretary of state John Kerry, former South Africa president Thabo Mbeki and officials from the European Union, said they could find no credible evidence to support the contentions.
Odinga, a polarising figure who is adored by his supporters, also ran and lost in 2013, and took his complaints about the widespread failure of electronic voting equipment to court. "I therefore wish to declare Uhuru Kenyatta.as president elect", said polls commission chairman Wafula Chebukati, as cheers and singing broke out at the national tallying centre.
As Kenyatta held a strong lead in provisional results with 96 percent of all polling stations counted, the election commission defended the voting system as secure, saying there were "no interferences before, during and after" Tuesday's election. Kenya's future is more important than any election.
"Going to court for us is not an alternative", Orengo said.
"We are very grateful that we were able to participate in the elections successfully and peacefully".
Hundreds of police in anti-riot gear are in the streets of the capital, Nairobi, amid fears of further protests by opposition supporters.
"Nobody should think that this is the end of the matter", he said. They stated that NASA allies in the IEBC have leaked the real numbers to them, which show that Kenyatta is not ahead by 1.4 million votes as the IEBC's website shows - rather it is Odinga ahead of Kenyatta by 286,298 votes.
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Uhuru, who is the sitting President of the Republic of Kenya, was declared victor together with his running mate William Ruto despite contests by the opposition that the election had been rigged.
Top opposition official James Orengo denounced the vote counting process as a "charade".
One of the leaders of the opposition Nasa alliance, Musalia Mudavadi, said before the results announcement that its concerns about the poll had not been adequately addressed.
They ruled out the possibility of seeking legal redress after the commission insisted on announcing the victor before addressing their concerns.
There have already been sporadic clashes between police and protesters in Nairobi's slums and in opposition strongholds in western Kenya. The Kenyan election commission has disputed his claims that its database was hacked and results were manipulated in favor of President Uhuru Kenyatta, who seeks a second term. Results could be announced within hours, though the election commission has until Tuesday to do it.
"We have urged people to remain calm as we delve deeper into this matter".
Two people were shot dead in Nairobi as they took advantage of the protests to loot, Nairobi police chief Japheth Koome said.
Polling stations opened at 6am and closed at 5pm but many were in the queues as early as 2am.
The election is a test of democracy in the East African economic power.