We used to say things like "unless you vote for/against x or y we won't vote for you or donate". That time has passed. It's over. They are done. Make sure they know.
https://www.senate.gov/senators/How_to_correspond_senators.htm
https://www.house.gov/representatives/find-your-representative
Yes they need the funding. Otherwise the candidate with more money will be able to buy his Dominion vote over the other.