Thursday saw Prime Minister hopeful Theresa May win a landslide victory in the final ballot of Tory MPs as Michael Gove was sensationally knocked out.
Mrs. May received 199 of the votes to Mrs. Leadsom's 84, with Mr. Gove trailing far behind on just 46 votes.
Now the Home Secretary will run against Andrea Leadsom in the battle to take over from David Cameron in number 10 Downing Street.
The result means Britain will have its second female prime minister within nine weeks, with the winner to be decided in a ballot of 150,000 Conservative party members over the summer recess.
The result was humiliating for Mr. Gove, who remarkably lost two votes since the last round of voting on Tuesday after a cynical attempt by his campaign chief to urge backers of Mrs May to lend votes to the Justice Secretary to exclude Mrs. Leadsom, a right-winger, from the final shortlist.