This year's presidential primary process has produced huge voter turnout numbers across the country, but it hasn't been enough to break the record, according to a report released today by American University.

As the Wall Street Journal's Susan Davis reports, it was the 1972 season that broke and will keep the record for the highest voter turnout percentage.

Despite the voter enthusiasm displayed, particularly on the Democratic side where Sens. Barack Obama and Hillary Clinton are still battling for the nomination, the 1972 primary season maintains the record-setter with 30.9% of eligible voters casting ballots versus 30.2% this year.

The center's director, Curtis Gans, said in an interview that the remaining primaries do not have enough eligible voters left to break the 1972 record. "There's not enough numbers to do that," he said.

The report may come as a surprise in an election season punctuated by stories of record turnout in many of the 34 states that have held primary contests so far. The report based its findings on states that hold primaries, and not caucuses.