Neil deGrasse Tyson has some very poignant (and sometimes a bit heated) things to say about how and why America stopped dreaming about space exploration. Check it out!
And for a longer version of his, here’s the first part of his “We Stopped Dreaming” mini-documentary.
And the second part:
In fact, there is a whole website dedicated to the need for doubling NASA’s budget, as NASA only gets half a penny of every tax dollar.