Iraqi Shiite cleric and leader Moqtada al-Sadr (C-L) shows his ink-stained index finger and holds a national flag while surrounded by people outside a polling station in the central holy city of Najaf on May 12, 2018 as the country votes in the first parliamentary election since declaring victory over the Islamic State (IS) group. HAIDAR HAMDANI | AFP | Getty Images

More than 91 percent of Iraq's votes have been tallied after polls closed over the weekend in Iraq's first election since defeating the Islamic State (ISIS) late last year. And they reveal a shock win for firebrand Iraqi cleric Moqtada al Sadr, who wasn't even running for prime minister, along with his coalition allies, the Iraqi Communist Party. He was followed by Iran-backed Shia militia leader Hadi Al Amiri, while incumbent Prime Minister Haider Al Abadi, initially predicted to win re-election, trailed in third. Voter turnout was a low 44.5 percent, indicating widespread voter apathy and pessimism, observers said. Reports show that Sadr's "Sairoon" alliance won more than 1.3 million votes, translating to 54 seats in the country's 329-seat parliament, taking the greatest share among a broad and fractured array of parties.

Who is Moqtada al Sadr?

A win for Sadr, the populist Shia leader known for his anti-American campaigns and his populist appeal to Iraq's young and poor, could dramatically change Iraq's political landscape and its relationship with external powers like the U.S. and Iran. In addition to pushing for the removal of U.S. troops from Iraq, Sadr is avidly opposed to Iranian influence in his country. That influence has grown significantly thanks to the pivotal role played by Iran-backed militias in driving out ISIS. The influential cleric, who has millions of religious followers, cannot become prime minister as he did not run for the position himself — but his electoral success means he will likely have a key role in deciding who does.

Powerful charisma

Sadr has spearheaded a number of political movements in Iraq, gaining infamy for directing attacks on U.S. troops in the wake of the 2003 Iraq invasion. His charismatic sermons have drawn hundreds of thousands into the streets over a range of causes. More recently, he's led campaigns and protests against corruption within the Shia-led government as well as against Iranian influence, and pledged to overcome sectarianism by leading a secular coalition that includes Iraq's communists. Sadr in 2003 created the Mahdi Army, which executed the first major armed confrontation against U.S. forces in Iraq led by the Shia community — and it posed such a threat that U.S. forces were instructed to kill or capture him. The group, which numbered up to 10,000, was also accused of carrying out atrocities against Iraq's Sunnis. It was disbanded in 2008, but re-mobilized in 2014 to fight ISIS. The cleric owes much of his religious following to the legacy of his father, an influential Iraqi ayatollah murdered in the 1990s for opposing former President Saddam Hussein, and has spent much of his career championing Shia causes.

AHMAD AL-RUBAYE | AFP | Getty Images

But in the last year, he's undergone something of a reinvention: he has reached out to Sunni Gulf neighbors, most notably in 2017 visits to Saudi Arabia and the United Arab Emirates, where he met with Saudi Crown Prince Mohammed bin Salman. The Gulf Cooperation Council (GCC) powers typically shunned Iraq's Shia, but are now making headway in the country through investment and economic aid, seen partially as an attempt to counter arch-rival Iran's entrenched influence in the country. Ahead of the election, Sadr pledged a commitment to abandon sectarianism by forming a coalition with secular Sunnis and Iraq's Communist Party, who have as a result seen their best election performance ever. "Sadr's strong showing suggests that he maintains a relatively loyal following and that his nationalist, cross-sectarian platform was effective at mobilizing voters in challenging conditions," said Ryan Turner, a senior risk analyst at London-based PGI Group. He has also stopped advocating violence, said Renad Mansour, an Iraq researcher and fellow at U.K. policy institute Chatham House. "He passed the use of violence for his political agenda," Mansour said. "But say if the U.S. come back and occupy Iraq, I imagine that this would change."

Possible kingmaker

Because of the fractured nature of Iraqi politics, no candidate or bloc has won an outright majority. The winners of the most seats must negotiate a coalition government within 90 days, during which a long complex process of compromise will have to unfold. Winning the greatest share of votes does not directly translate to leading the government. "Depending on the final tallies and political jockeying, Sadr may find himself in a position to play kingmaker, which could see Abadi reappointed prime minister," Turner said, referring to the current prime minister, who was widely praised for leading the fight against ISIS and for balancing relationships across sects and external powers. But to do so, Sadr would likely have to outmaneuver Iran, which would prefer to see Amiri — the candidate who finished second place — assume the premiership. Tehran wields much of its influence by pushing its preferred policies through Iranian-backed candidates and political players like Amiri. A major objective of Iran's is to push the U.S. out of Iraq, where some 5,000 troops still remain.

U.S. Army paratroopers assigned to Bravo Troop, 5th Squadron, 73rd Cavalry Regiment, 3rd Brigade, 82nd Airborne Division, maneuver through a hallway as part of squad level training at Camp Taji, Iraq. Source: Department of Defense