Just saw that Kain, thanks for posting.
This legislation is being introduced by my own State Representative from my district; Brendan Williams.

The proposed law reads:
1 AN ACT Relating to liability for the criminal use of firearms sold
2 at gun shows or events; and adding a new section to chapter 9.41 RCW.
3 BE IT ENACTED BY THE LEGISLATURE OF THE STATE OF WASHINGTON:
4 NEW SECTION. Sec. 1. A new section is added to chapter 9.41 RCW
5 to read as follows:
6 (1) A person who sells, delivers, or otherwise transfers, at a gun
7 show or event, a firearm to any person whom a criminal background check
8 in accordance with RCW 9.41.090 and 18 U.S.C. Sec. 921 et seq. would
9 have revealed was ineligible under RCW 9.41.040 to possess a firearm,
10 is strictly liable for damages for the injury or death of another
11 person that results from the criminal use of that firearm by any
12 person.
13 (2) For the purposes of this section, "gun show or event" means a
14 place or event, a gun trade show, gun collectors' show, flea market, or
15 auction, other than a permanent retail store, at which three or more
16 individuals assemble to display, sell, lease, or transfer new or used
17 firearms or firearm components to the public and that is not exempt
18 from collecting sales tax under RCW 82.08.0251. "Gun show or event"
19 includes the entire premises provided for the gun show or event,
p. 1 HB 2477
1 including parking areas near the gun show or event that the sponsor
2 knows or should reasonably know will be used for parking for the gun
3 show or event.
--- END ---
HB 2477
Find your own legislator here and write to them, it is very easy; DO IT NOW!http://apps.leg.wa.gov/DistrictFinder/Default.aspx