Probably not a hack but a domain someone forgot to register.
Is this really his official website?
According to Wikipedia, MikePence.com was his official campaign website and other than that there is only his page on the whitehouse web page and on Indiana's state government ("former governor"). So I don't think this is a hack, this is just someone registering an official looking domain name and putting a spoof website on there. (It is also registered with GoDaddy's private WHOIS registration.)
No it's not, funny though.
It isn't, but it's amazing that it's the number one result on Google for "Mike Pence".