O'Malley announces he will seek Democratic nomination for 2016 White House

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Former Maryland Gov. Martin O’Malley on Saturday entered the 2016 White House race, posing a long-shot challenge to Hillary Clinton for the Democratic nomination by vowing to reform Wall Street and other corridors of power so that every American can share in the country’s prosperity.

Declaring his plan to “Rebuild the American Dream,” O’Malley told a crowd of several hundred in Baltimore, where he was once the mayor, “I’m running for you. … My decision has been made. … I declare that I am a candidate for president of the United States.”

In a speech intended to appeal to progressives and other members of the Democratic left, O’Malley vowed to go after Wall Street “cheats” and others who have turned the economy “upside down” to their favor.

The 52-year-old O'Malley has made frequent visits in recent months to early-voting Iowa, where he was headed later Saturday, and New Hampshire, his destination Sunday.

Still, he remains largely unknown in a field dominated by Clinton.

O’Malley made the announcement at the base of Federal Hill, in Baltimore, about a month after the Freddie Gray riots, which have been followed by a spike in homicides across the city.

A handful of demonstrators were at the O’Malley announcement to protest his law-enforcement policies as mayor.

They held up signs including ones that read "Stop Killer Cops" and  “What about Freddie Gray?"

Already in the race is Vermont Sen. Bernie Sanders, and Independent who could be O'Malley's main rival for the support of the Democratic left.

An ally of former President Bill Clinton, O'Malley was the second governor to endorse Hillary Clinton's presidential campaign in 2007. But he made clear that he thinks Democrats deserve a choice in the 2016 primary.

"The presidency is not a crown to be passed back and forth ... between two royal families," O'Malley said. "It is a sacred trust to be earned from the people of the United States, and exercised on behalf of the people of the United States."

O’Malley in his roughly 30-minute speech pointed to recent news reports that Goldman Sachs CEO Lloyd Blankfein would be "fine" with either Clinton or former Florida Gov. Jeb Bush, a leading Republican contender and the son and brother of presidents, in the White House.

It was a forceful message that O'Malley will focus on overhauling the financial system, a priority for liberals opposed to the bailouts of Wall Street banks.

"Tell me how it is, that not a single Wall Street CEO was convicted of a crime related to the 2008 economic meltdown? Not a single one," O'Malley said. "Tell me how it is, that you can get pulled over for a broken tail light, but if you wreck the nation's economy you are untouchable?"

Aides said O'Malley called Hillary Clinton on Friday to tell her he was running. By Saturday afternoon, Clinton had tweeted, "Welcome to the race, Gov. O'Malley. Looking forward to discussing strong families and communities."

O'Malley has spoken often about the economic challenges facing the nation and said he would bring new leadership, progressive values and the ability to accomplish things.

"We are allowing our land of opportunity to be turned into a land of inequality," he told the crowd.

O'Malley has presented himself to voters as a next-generation figure in the party, pointing to his record as governor on issues such as gay marriage, immigration, economic issues and the death penalty.

His tenure was marked by financial challenges posed by the recession, but O'Malley pushed through an increase in the state's minimum wage while keeping record amounts of money flowing into the state's education system. He backed a bill to allow same-sex marriage, which lawmakers passed and voters approved in 2012. He oversaw a sweeping gun-control measure and a repeal of the death penalty.

He also raised taxes on multiple occasions -- on higher earners, sales of goods, vehicle titles, gasoline, cigarettes, sewer services and more. Republican critics branded him as a tax-and-spend liberal and the GOP defeated O'Malley's hand-picked successor in 2014.

But his record on criminal justice has been scrutinized in recent weeks after riots in Baltimore broke out following the death of Gray, an African-American man who died in police custody following his arrest last month.

O'Malley was known for his tough-on-crime, "zero tolerance" policies that led to large numbers of arrests for minor offenses. Critics say it sowed distrust between police and the black community. Supporters note the overall decrease in violent crime during his tenure. O'Malley has defended his work to curb crime, saying he helped address rampant violence and drug abuse.

O'Malley called the unrest "heartbreaking" but said "there is something to be learned" from April 27, the night of the worst rioting, after Gray's funeral.

“There is something to be offered to our country from those flames,” he said. “For what took place here was not only about race, not only about policing in America. It's about everything it is supposed to mean to be an American."

Megan Kenny, 38, of Baltimore, who held the sign that read "Stop Killer Cops" said O'Malley's decision to run was "a strange choice," especially because of the recent rioting. She attributed the unrest to his "ineffective zero-tolerance policy."

O'Malley could soon be joined in the Democratic field by former Rhode Island Gov. Lincoln Chafee, who plans to make an announcement next week, and former Virginia Sen. Jim Webb, who is exploring a potential campaign.

Sanders has raised more than $4 million since opening his campaign in late April and sought to build support among liberals in the party who are disillusioned with Clinton.

In a sign of his daunting task, Maryland Sen. Barbara Mikulski, his former boss and mentor, is supporting Clinton. She said in a statement that O'Malley "should follow his dreams. And while I've already announced my support for Hillary Clinton, I know that competition is good for democracy."

One of O'Malley's first tasks as a candidate would be to consolidate support among Democrats who are reluctant to back Clinton and eyeing Sanders.

"It's not going to be a free pass for anybody running for president," said Jereme Leazier, an O'Malley supporter who traveled to the rally from Hagerstown, Maryland. "He's going to ask the hard questions."

The Associated Press contributed to this report.