Now might be a good time to do so.
If you haven;t got a clue how to do so (in which case I am disgusted, but whatever) you can find the information on the left side of this blog, at the top, marked "contacting the congress" (or you can click on the link here).
Tell em NOT to vote for Toomey Manchin.
You voice might be the one that makes him/her/it change their mind.
Even if they have already stated their opposition to the bill, make sure that they know that it was the right decision.
Congressmen and women and senators all want to get re-elected. Make sure that they know how you feel.