Two senators are the lone contenders in the by-election on November 21 for Pembroke Central, the constituency left vacant by the death of sitting Progressive Labour Party MP Walton Brown last month.At the close of nomination day yesterday, the contest for Constituency 17 was down to Jason Hayward, of the PLP, and Dwayne Robinson, of the One Bermuda Alliance.Mr Hayward announced in advance on the PLP’s Facebook page that, after successfully undergoing surgery, he would be unable to attend at the polling station, St Paul AME Church in Hamilton.