On the subject of having children and wielding power

If you're not up on UK politics, there has been a kerfuffle recently because one of the candidates for Conservative Party Leader (and thus Prime Minister) has declared heavily implied that having children confers upon a parent an additional level of empathy, long-sightedness and investment in the future. Hence the other candidate, who is childless, is not as well suited to wield power and lead the party (and thus the country). Both of the candidates are women.

Has the lack of correlation between parenthood and sagacity really been so insufficiently demonstrated by men in power who have children?

ETA: In the time it took me to write this post, Candidate #1 has withdrawn from the leadership race.