CASPER, Wyo. — Third-generation Wyomingite Kenneth R. Casner announced his candidacy for governor, pledging to represent the state’s working class without soliciting campaign donations. Casner, 75, plans to formally file as a Democrat in Cheyenne today, May 15. Although he first announced his intent to run in early January, the filing marks the official start of a campaign he says is rooted in a lifelong connection to the state. “I truly love Wy…