A lame duck congresswoman who supports presumptive Democratic presidential nominee Hillary Clinton said on Sunday she didn’t realize she's a superdelegate.

Rep. Donna Edwards, D-Md., was defeated in her state’s Democratic Senate primary in April, but she's slated to serve as an unpledged superdelegate at July’s Democratic National Convention in Philadelphia. Though she would appear poised to support Clinton, it seemed on Sunday that Edwards was unaware of her assignment.

“First of all, I didn’t even know I was a superdelegate,” she said on "Meet The Press," after moderator Chuck Todd referenced her status.

Clinton has become her party’s likely nominee in part because she’s amassed a superior number of superdelegates to her competitor, Sen. Bernie Sanders. Clinton leads Sanders in superdelegates 547-to-46 and in pledged delegates 1,776-to-1,501. Superdelegates can support any candidate they choose, regardless of who their home state votes for.

Sanders has railed against the role of superdelegates, pointing to them as an example of establishment figures tipping the scales. Ahead of Tuesday’s primary in California, Clinton remains 50 delegates shy of achieving the 2,383 delegates needed to claim the Democratic presidential nomination.

But Edwards pushed back on Sanders' argument – while at the same time allowing that changes could be made in future elections.

“What I do know is these were the rules going in,” she said. “All of us knew these rules going in, and I think it is time for us to rethink them. But you don’t do that in the middle of the game.”