Mr Johnson is not only the bookmakers' clear favourite but, according to polls, the most popular with the 160,000 party members who will ultimately make the choice.
Bw Johnson sio tu anayependwa zaidi na watengenezaji fedha lakini, kulingana na kura za maoni, ndiye anayependwa zaidi na wanachama 160,000 wa chama ambao hatimaye watafanya chaguo.