Twenty-six states are challenging the action, which would grant temporary, quasi-legal status and work permits to as many as 4 million parents who entered the U.S. illegally before 2010.
The 4-4 vote means union opponents have failed, for now, to reverse a long-standing decision that allows states to mandate "fair share" fees from nonunion workers.
Justices rejected the former Illinois governor's appeal of his corruption convictions, such as attempting to sell an appointment to the vacant Senate seat once occupied by President Obama.
For the fourth time in five years, the justices consider a requirement of the Affordable Care Act that most health plans provide women access to birth control without copays.
Samsung says it paid too much in damages after Apple accused it of copying aspects of the iPhone's design, arguing, "The law of the smartphone cannot follow reflexively from the law of the spoon."
In an interview with NPR, the president says Senate Republicans owe it to the Founding Fathers to give Judge Merrick Garland a Supreme Court confirmation vote.
In a wide-ranging interview, Obama says Republicans have supported Judge Merrick Garland in the past, and that refusing to consider him for the Supreme Court could have severe consequences.
Republicans remain steadfast in their refusal to consider any nominee to the Supreme Court during an election year. President Obama told NPR that argument is "puzzling."