The script is not loading as you are suing an old version of jquery(1.7.2) and the validation script requires a minimum of version 1.8.1.
The latest version of WordPress ships with jQuery 1.11.0.
As your WordPress is up to date, it looks like a plugin or more likely the them is turning off the default jQuery and loading an old version from Google.
This is a bad practice, and as you have discovered it will break things. You can check if it’s the them by using the Theme Test Drive plugin (https://wordpress.org/plugins/theme-test-drive/) and testing an event.
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