The victory all but assures Kenney will stay on as mayor in Philadelphia, where Democrats outnumber Republicans by a nearly 7-to-1 ratio, and the city has not elected a Republican mayor in nearly 70 years. Republican Billy Ciancaglini ran unopposed in the GOP primary.
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"Our success tonight would not have been possible without the many individuals who took action to support our cause. Our cause to provide quality for all children, our cause to rebuild our schools, rec centers and parks. Our cause to build a fair and equitable city where everyone has an opportunity to succeed," Kenney said during his victory speech to supporters.
Kenney has had an eventful first term, antagonizing President Donald Trump over Philadelphia's sanctuary city status and carrying out the tax on soda and other sweetened drinks, which inspired several other cities around the country to enact their own.
Two longtime city political figures ran against him: state Sen. Anthony Williams, who has served three decades in the state House and Senate combined, and Alan Butkovitz, the former city controller defeated in 2017.
Both derided the soda tax as regressive and were banking on voter outrage over the tax to propel them to victory. They also argued Kenney, 60, hadn't done enough to combat other major problems plaguing the city, including crime and poverty.
No incumbent mayor has lost their bid for re-election in seven decades and Kenney, never seemed concerned, calling his challengers "annoying gnats" in a radio interview.
Mayor Kenney speaks to supporters after winning Democratic nomination
The soda tax had been a flashpoint in the election.
It has generated more than $130 million, which is paying for free preschool programs and other community services like revamped recreation centers and libraries.
It has also drawn criticism from some consumers and businesses but withstood court challenges and a public relations onslaught by grocers and the beverage industry.
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In a brief and a rapid-fire victory speech, Kenney did not directly mention the soda tax but spoke about his efforts to improve the public education system in Philadelphia, noting he "took on an entire industry" in order to fund pre-kindergarten classes.
"I believe education is the best pathway out of poverty," he said.
Philadelphia's enactment of the 1.5 cent-per-ounce tax on soda and other sweetened beverages - at the distributor level - has inspired other municipalities to follow suit, with varying results.
A new study found that Philadelphia's 2017 tax led to a 38% decline in sugary soda and diet drink sales that year, even when taking into account an increase in sales in neighboring towns. It bolsters evidence that soda taxes can reduce sales, but whether they influence health remains unclear.
Kenney didn't try to sell the tax as a way to discourage people from drinking unhealthy beverages. Instead, he billed it as a way to help lift citizens out of poverty by improving early childhood education and rebuilding and renovating recreation centers, parks and libraries around the city.
The mayor's office, in a statement May 14, said the study is "entirely supportive" of the mayor's stance on the tax. They disputed beverage industry's claims that it has led to job losses.
Former New York Mayor Michael Bloomberg, a big proponent of soda taxes, recently donated $1 million to a political action committee that supported Kenney's re-election effort. The beverage industry, in turn, spent over $500,000 in the last month, and its PAC started airing television commercials critical of Kenney in April. They've spent millions in the last two years combatting the tax.
A recent poll by The Philadelphia Inquirer listed voters' top three concerns as crime, poverty and education.
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The city recorded 350 homicides in 2018, the highest in over a decade - and the numbers are currently running higher than they were last year at this time.
Philadelphia is also the nation's poorest big city, with a poverty rate of nearly 26%.
And its opioid crisis is among the worst in the U.S., with more than 1,100 fatal overdoses in 2018. Kenney and other city officials announced last year that they'd support a private entity operating and funding supervised injection sites - locations where people can shoot up under the supervision of a doctor or nurse who can administer an overdose antidote if necessary.
Both Williams and Butkovitz opposed such sites, citing the legal uncertainty and community concern over putting such sites in their neighborhoods.
One thing the candidates all agreed on is the city's status as a sanctuary city.
Sanctuary cities - like Philadelphia, New York and San Francisco - are places where authorities don't work with Immigration and Customs Enforcement to round up those living in the country illegally. A federal appeals court ruled in February that the Justice Department can't deny Philadelphia millions in public safety funding because of its sanctuary city status.
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The Associated Press contributed to this report.