Zach Leatherman digs under the cover of the presidential candidates’ websites and reveals that font loading is a nuanced and complicated business:
Using a web font service doesn’t necessarily mean that your web site will use best practices. We must be knowledgeable about the internals of the tools we use in order to best utilize them to our advantage. At the end of the day if you don’t want to put any effort into it, it’s safer to use TypeKit.