The bill in North Dakota is House Bill No. 1496, and it will be discussed/voted on this Friday, February 6th at 9:00am by the ND House Agriculture Committee (it is not yet scheduled for debate in the Senate). At this time, they are only discussing whether or not to fund the study, and are not deciding whether or not to build the slaughterhouse.
The following links to a list of all of the ND House Committees. The Agriculture Committee is listed first, and a link is provided to the contact information for each committee member.
Here are links to contact the major newspapers:
1) The Forum (Fargo's newspaper): printed a January 28th editorial against the slaughterhouse
Email letters to: http://firstname.lastname@example.org
2) Grand Forks Herald
Email submission form: http://www.grandforksherald.com/contact/index.cfm?page=contactForm&email_id=2
3) Bismarck Tribune
Email submission form: http://www.bismarcktribune.com/home/letters/
If you call DO NOT let them tell you that you are not from North Dakota and to call your own legislators. This is a national issue that impacts every horse owner in America. Any owner could have his/her horse stolen and end up in kill plant. Every owner should be able to sell their horse without the fear of the buyer being a kill buyer.
Animal Law Coalition's information on the subject: http://www.animallawcoalition.com/horse-slaughter/article/663