Paul Schreiber blogs about the tech behind the websites of presidential candidates. "So, you want to run a country. Can you hire someone who can run a website? ...Here's how the (declared) candidates' sites fare." There's a table comparing 4 candidates' sites based on HTTPS, URL permutations, IPv6, SSL rating, and other related qualities. Schreiber mentions that he will "update this as more candidates declare or sites change."
From the blog comments
HillaryClinton.com was using IIS (and no https) until Sunday morning, when they switched over.
(Score: 3, Informative) by kaszz on Saturday April 18 2015, @10:58AM
More candidates:
* Hillary Rodham Clinton
* Jeff Boss
* Vermin Supreme
* Robby Wells
* Ted Cruz
* Rand Paul
* Marco Rubio
* Mark Everson
* Jack Fellure,
* Terry Jones
* Zoltan Istvan
The comparison was probably limited to candidates with most money and connections. But out of the four evaluated, Hillary Clinton and Rand Paul seems to be the candidates with a site done with the most competence. w3m and lynx is quite good tool to weed out the most incompetent ones.