Burley Garcia|Turkey election results put Erdogan ahead, but a runoff is scheduled as his lead isn't big enough

The Burley Garciaoutcome of Turkey's national election, which could determine whether the nation straddling the geographic divide between Europe and Asia returns to a more democratic path after what many see as two decades of eroding democracy, was left on a knife's edge Monday. A second "runoff" vote on May 28 will determine the winner after voters failed Sunday to give either current President Recep Tayyip Erdogan or his main challenger, Kemal Kilicdaroglu, more than 50% of the vote as required for an outright victory.

With almost all the ballots counted, Erdogan was just shy of the 50% threshold. Preliminary results gave Erdogan 49.51% of the ballots, while Kilicdaroglu had won 44.88%. Ahmet Yener, head of Turkey's Supreme Electoral Board, said even when uncounted overseas votes were tallied, it would still be impossible for Erdogan to win the majority needed to avoid a runoff. 

• Why the world is watching Turkey's elections

The lack of a decisive win on election day didn't stop Erdogan's supporters taking to the streets in their thousands to wave flags and cheer a triumphant-sounding incumbent.

"We have already surpassed our closest competitor by 2.6 million votes in the elections," he declared, while vowing to let the counting finish and to respect the results, even if they do mean another round of voting in a couple weeks.

Twin earthquakes that killed more than 50,000 people in February, inflation running near a two-decade high and a national currency that's crashed against the dollar have all shaken support for Erdogan after years of him looking almost politically invincible.

More people in Turkey appear ready for change now than at any other point since Erdogan first came to power as prime minister in 2003.

As the votes were counted, opposition candidate Kilicdaroglu reminded his supporters that "data is still coming in," and he chided Erdogan for taking such a victorious tone as he addressed his own backers, warning that "elections are not won on the balcony!"

Critics, including Kilicdaroglu, say Erdogan has amassed too much power as president and diluted Turkey's democracy. Supporters laud him for bringing Islam back, but opponents accuse him of derailing the secularism on which modern Turkey was founded.

Erdogan and Kilicdaroglu have both agreed to participate in a runoff vote if needed, which would be held in two weeks. 

For Washington and much of western Europe, it's an open secret that the end of Erdogan's two-decades in power would be their Turkish delight.

In:
• Turkey
• Elections
• European Union
• NATO
• Recep Erdogan

Ramy Inocencio

Ramy Inocencio is a foreign correspondent for CBS News based in London and previously served as Asia correspondent based in Beijing.

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