If confirmed, Obama's nominee will replace Justice Antonin Scalia, who died on Feb 13. The court is divided 4-4 between conservatives and liberals. Garland could move the court to the left for the first time in decades.
Anita Alvarez charged a police officer with murder in the McDonald shooting, but not until more than a year after the incident and hours after a judge ordered city officials to release the tape publicly.
Rubio's exit brings the race for the GOP nomination closer to a two-man contest between Donald Trump and Texas Sen. Ted Cruz, with Ohio Gov. John Kasich trailing in third.
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