Before even formally clinching the Democratic nomination, Joe Biden's campaign has been barraged by questions about who he would select as his running mate. In March, Biden said he would choose a woman to be his vice president.

There have been several possibilities made public in recent months, but the latest reports suggest that it may come down to three choices: California Sen. Kamala Harris, former National Security Adviser Susan Rice, and Massachusetts Sen. Elizabeth Warren.

The latest betting odds from legal sports gambling site Bookies shows Harris with the strongest odds at +100, followed by Rice at +500 and Warren at +900.

Here’s a look at the background of these female lawmakers and what they bring to the ticket.

Kamala Harris

Harris, 55, has served as the junior U.S. Senator from California since 2017. She previously served as California’s Attorney General from 2011 to 2017. Harris has spoken out frequently on police reform after the death of 46-year-old African-American George Floyd, who was killed on May 25 after a white Minneapolis police officer pressed his knee on Floyd's neck for nearly nine minutes.

Harris brings diversity to the ticket. Her father emigrated from Jamaica, while her mother was born in India.

Harris gained attention after delivering strong questions during Brett Kavanaugh's Supreme Court confirmation hearing as well as her campaign for the Democratic nomination.

Susan Rice

Susan Rice, 55, brings extensive experience in foreign affairs. She served with Biden during the Obama administration as National Security Adviser from 2013 to 2017 and U.S. Ambassador to the United Nations from 2009 to 2013. During the Clinton administration, she worked on the National Security Council from 1993 to 1997, where she helped implement policy during the Rwandan Genocide.

She was a Rhodes scholar and received a Doctorate in Philosophy from New College, Oxford in 1990. After graduation, she worked as a consultant at McKinsey & Company from 1990 to 1992.

Rice is the daughter of African-American parents. Her father, Emmett, was a governor of the Federal Reserve and her mother, Lois, graduated from Harvard and was a renowned education policy expert.

Republicans have criticized Rice for misleading the public in the aftermath of the attack on the U.S. consulate in Benghazi, Libya. The attack killed four Americans, most notably the U.S. Ambassador to Libya Christopher Stevens. If Rice is selected as Biden’s running mate, Trump and Republicans will likely use the Benghazi issue to mobilize conservative supporters.

Elizabeth Warren

Warren, 70, has represented Massachusetts in the Senate since 2013. She pushed for more strict regulations on big banks after the financial crisis of 2008. From 2008 to 2010, Warren was the Chair of the Congressional Oversight Panel, the body overseeing the bank bailouts during the crisis. She also helped set up the Consumer Financial Protection Bureau (CFPB), an agency dedicated to protecting consumers from predatory practices in the financial sector.

Her populist anti-Wall Street credentials could help the Biden ticket pick up more progessive voters in the Democratic Party who voted for Vermont Sen. Bernie Sanders during the primaries.

Aside from Harris, Rice and Warren, another possibility is Florida Rep. Val Demings, 63, who served as the chief of the Orlando Police Department from 2007 to 2011. Her experience in the police could be a liability, with her candidacy being scrutinized by activists in the Black Lives Matter movement.

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