Rep. Greg Walden has been a staunch supporter of the National Rifle Association. It isn’t easy to find how much money he has taken from the NRA. Here are links to some information about Walden and his relationship to the NRA.
http://salem-news.com/articles/march142014/walden-nra.php
https://www.portlandmercury.com/blogtown/2018/02/19/19686747/here-are-the-oregon-politicians-who-have-cashed-checks-from-the-nra
https://www.thenation.com/article/call-the-top-20-top-recipients-of-nra-cash-in-congress/
http://www.ontheissues.org/House/Greg_Walden_Gun_Control.htm