Exit polls in Georgia's presidential election indicated a big win on Sunday for the candidate backed by billionaire Prime Minister Bidzina Ivanishvili, cementing his control over the U.S.-aligned former Soviet republic.

Giorgi Margvelashvili, a former university rector with limited political experience, should get about 67 percent of the vote, the exit polls predicted.

He will succeed Mikhail Saakashvili, who during nearly a decade in power put Georgia on the path toward democracy, but deeply angered many Georgians with what they saw as the excesses and authoritarian turn of the later years of his presidency.

His party's candidate, former parliamentary speaker David Bakradze, was in second place with 20 percent. Bakradze, who now heads the opposition in parliament, quickly congratulated Margvelashvili and said he was ready to work together with the prime minister and president.

The exit polls were conducted by the market research organization GfK and commissioned by Georgian private television station Rustavi2.

Even with Margvelashvili's convincing victory, much remains uncertain.

Ivanishvili has promised to step down next month and nominate a new prime minister, who is almost certain to be approved by parliament. Under Georgia's new parliamentary system, the next prime minister will acquire many of the powers previously held by the president.

Ivanishvili has not yet named his choice to lead the country. And he says he intends to maintain influence over the government, although how is not entirely clear. But his fortune, estimated at $5.3 billion, gives him considerable leverage in this country of 4.5 million people with a gross domestic product of $16 billion.

Much uncertainty also hangs over Saakashvili's future. Since last year's election and what was in effect a transfer of power, dozens of people from Saakashvili's team, including several former government ministers, have been hit with criminal charges and some have been jailed, including the former prime minister.

Ivanishvili confirmed in an interview with The Associated Press that Saakashvili also is likely to be questioned by prosecutors once he leaves office next month.

Prosecutors have reopened a criminal inquiry into the 2005 death of Zurab Zhvania, who was Saakashvili's first prime minister. Zhvania's death was attributed to accidental carbon monoxide poisoning caused by a faulty gas heater, but his brother has accused Saakashvili of hiding the truth.

Saakashvili also may face questioning over the 2008 war with Russia, which ended with Russian troops in full control of two breakaway Georgian republics. His opponents accuse him of needlessly antagonizing Russia and giving Moscow a pretext to invade.

Saakashvili repeated Sunday that he has no plans to flee the country. "No one can forbid me either to leave the country or to stay, but I do not intend to leave Georgia," he told television journalists while jogging along the Black Sea coast in western Georgia.

Bakradze's clear margin over the other 21 candidates should help Saakashvili's party maintain political influence.

He had faced the biggest challenge from Nino Burdzhanadze, a veteran politician who boasts of good relations with Moscow and has called for Saakashvili to be jailed. The exit polls showed her running a distant third with 7.5 percent.

While Ivanishvili made his money in Russia and has had some success in restoring trade ties with Georgia's hostile neighbor, he has maintained the pro-Western course set by Saakashvili.

"Nobody can change this. This is the will of the Georgian people, to see their country in the EU and in NATO," said Alexi Petriashvili, one of Ivanishvili's ministers. "The majority see the U.S. as Georgia's strongest strategic partner."

If not for Washington, Georgia most likely wouldn't have survived as an independent state, Petriashvili told the AP. He pointed to Washington's support for the closing of Russian military bases in Georgia in 2005.

The U.S. supports Georgia diplomatically and financially, with assistance in 2013 totaling about $70 million.

Ivanishvili's government has come under pressure from U.S. and EU officials to show that the justice system isn't being used to settle political scores and to refrain from jailing Saakashvili.

Despite the disillusionment with Saakashvili in recent years, the achievements of his presidency are difficult to deny. He brought the economy out of the shadow, restored electricity supplies, eradicated a corrupt traffic police force, and laid the foundation for a democratic state. Georgia's GDP has quadrupled since Saakashvili became president after leading the peaceful 2003 Rose Revolution.

"Yes, everyone forgot how we sat in the darkness and what kind of roads we had," Marina Vezirishvili, 46, said after voting in Tbilisi. "But just so you know, I'm not a member of Misha's party and I didn't vote for their candidate."

Get the Monitor Stories you care about delivered to your inbox. By signing up, you agree to our Privacy Policy

Saakashvili, commonly known as Misha, has earned wide international respect for allowing the government to change through the ballot box rather than through revolution for the first time in Georgia's post-Soviet history.

"We have to recognize, whatever our position is inside Georgian political fights, that Georgia has been a great example," said Joao Soares, head of an election monitoring mission from the Organization for Security and Co-operation in Europe.