Actually...
I have noticed no real consistent pattern of one party or the other being particularly "pro-space" or "anti-space." As far as the idealistic end of it is concerned, it almost seems to be an individual quirk of each candidate.
Frankly, most of the space program's funding over the decades has been driven by Senators and congressmen pushing projects in their own districts. This influence far outweighs anything a president does, or any "grand vision."
It's one reason NASA is about the development process, not about the results.