By Joan Biskupic, CNN Chief Supreme Court Analyst

(CNN) — The brazen partisan redistricting underway in Texas, with Republicans attempting to entrench themselves in office and Democrats weighing a counter-offensive in blue states, was greenlit by the US Supreme Court six years ago.

Chief Justice John Roberts, in an opinion for a 5-4 court, declared that federal judges could not review extreme partisan gerrymanders to determine if they violated constitutional rights.

Roberts’ opinion reversed cases that would have allowed such districts – drawn to advantage one political party over another irrespective of voters’ interests – to be challenged as violations of the First Amendment’s guarantee of free speech and association and the Fourteenth Amendment’s guarantee of equal protection.

The

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