At present there are two legislative proposals regarding the space program. The House and Senate bills, plus the Administration's request. Of these, the Senate bill is more favorable to the goal of keeping alive the shuttles and heavy lift until we can build public support for a bold "in this decade" plan to go to Mars, the Moon and the asteroids.
So call your Senators supporting the NASA Appropriation bill--call right away as the Senate will likely vote anytime in the next couple days. Please also call your Representative in support of the Senate bill, not the worse House bill. Thank you.