WASHINGTON — The stunning series of liberal decisions delivered by the Supreme Court this term was the product of discipline on the left side of the court and disarray on the right.

In case after case, including blockbusters on same-sex marriage and President Obama’s health care law, the court’s four-member liberal wing, all appointed by Democratic presidents, managed to pick off one or more votes from the court’s five conservative justices, all appointed by Republicans.

They did this in large part through rigorous bloc voting, making the term that concluded Monday the most liberal one since the Warren court in the late 1960s, according to two political-science measurements of court voting data.

“The most interesting thing about this term is the acceleration of a long-term trend of disagreement among the Republican-appointed judges, while the Democratic-appointed judges continue to march in lock step,” said Eric Posner, a law professor at the University of Chicago.