BATON ROUGE, La. (AP) — Shreveport Mayor Adrian Perkins is entering Louisiana’s U.S. Senate race. He announced Wednesday that he’s trying to unseat Republican incumbent Bill Cassidy in a last-minute entrance into the competition as the candidate signup period began. The Democratic mayor of the northwest Louisiana city has been in office since December 2018. He launched his campaign with an introductory video describing his Army career and saying Washington’s poor handling of the coronavirus outbreak persuaded him to jump into the Senate race on the Nov. 3 ballot. He joins at least three other announced Democratic contenders challenging Cassidy. They’re trying to oust a Republican incumbent in a red state who has millions in the bank.