If no presidential candidate wins a majority of the vote in the first round, a runoff will be held later this month.

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Meanwhile, the provincial totals showed "big shifts" toward Ahmadinejad compared with 2005, when he came in second in the first round of voting and won office in a runoff, Silver said.

CNN: Analysts pore over 'ambiguous' Iran results

The vote was a runoff between the two top finishers of the first round of elections in April.

CNN: French President-elect Hollande casts doubt on austerity

If no candidate gets a majority of the vote in the first round, the top two will progress to a runoff to be held June 16-17.

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Counting the rejected votes would greatly add to the number needed for a candidate to break the 50% threshold for a first-round win and increase the prospect of a runoff due within a month.

BBC: Kenya election: Raila Odinga camp says vote 'doctored'

The runoff will be a race between the man who became the city's first black mayor, and a man vying to become its first Latino mayor.

CNN: Several large cities getting new mayors

For the first time this election season, Marist examined how Ms. Quinn would fare in a potential runoff, triggered when no primary candidate wins 40% of the vote or more in the Sept. 10 primary.

WSJ: Anthony Weiner Joins the New York City Mayoral Debate

Although it took over a month for Zimbabwe's electoral commission to announce the results of the first round, which went against Mr Mugabe, it declared Mr Mugabe the winner of the runoff in less than two days.

ECONOMIST: Zimbabwe

First, the cultivation of genetically engineered crops has drastically reduced the use of chemical pesticides, resulting in less runoff into waterways and ground water and fewer poisonings of farmers and their families.

FORBES: Bittman of the 'New York Times': Always Out To Lunch