Rep. Daniel Webster officially announced his bid for House speaker Tuesday morning, two days before the House GOP is slated to vote on a replacement to retiring Speaker John A. Boehner. Mr. Webster, a third-term Republican from Florida, joins Rep. Jason Chaffetz, Utah Republican, as officially announced challengers hoping to deny the speakership to Rep. Kevin McCarthy, the current No. 2 who had seemed on a glide-path to ascend to the House’s top post.