Yes, Congress is a problem for NASA. But not because it doesn’t give it enough money. As Clark notes, NASA has plenty of money, if it wanted to, and were allowed to spend it sensibly. The problem with Congress it that it won’t let NASA do so, even if it wanted to. It will always be more important to Congress where the money is spent than how it is spent, which is why government space programs are so cost ineffective (and that was true going all the way back to Apollo). Apollo succeeded because it did have huge bales of cash thrown at it, but it certainly wasn’t politically sustainable or affordable, any more than redoing it will be.