Amen. How about "responsive"?
As one who probably doesn't really care much about space exploration, and as a politician, I can appreciate that he might shift some priorities as he became aware of the importance of them to a part of his constituency.
The only people I know who have not changed their opinions on anything since early adolescence are not only naive, immature and cling to ideologies but follow disasterous policies. Hitler comes to mind, as do some current American political thinkers.
That's why "change" is so attractive now. Think "responsive", not "stay the course at any price".
Arf