Just days before the April 22 primary, Sens. Hillary Clinton and Barack Obama will square off at the National Constitution Center, according to Forbes.com (as written by former Philadelphia Inquirer Managing Editor Carl Lavin).

The bruhaha will take place on April 16, the 21st debate among Democrats, though just the second between only Clinton and Obama. A handful of then-contenders debated at Drexel Universty in October.

Plans are already underway for another debate in North Carolina before its May 6 primary, though their are no guarantees both candidates will still be in the running after Pennsylvania Democrats vote. Obama has agreed to the date.