Allina Health hospital nurses voted Monday night to reject a contract offer from their employer, increasing the likelihood that their walkout over health benefits, staffing and safety concerns will go down as the longest nursing strike in Minnesota history. While the Minnesota Nurses Association had not recommended a "no" vote, many nurses said they felt Allina's latest offer was too similar to one they rejected in August, and to the terms their union negotiators rejected during last-ditch negotiations in September to avert a strike.