So tell me then, what exactly is the purpose of registering that domain?
To disseminate negative advertisements about Sink to Sink supporters, and to try to dissuade Sink supporters from donating to her -- and in a best-case scenario to donate to the NRCC. It is very obviously targeted toward Sink supporters, but the website doesn't make any show of being pro-Sink and it's ludicrous to suggest it does.
You do realize that most donation pages like that are designed to function as landing pages? That means that they are built with the sole intent of the link being shared via email, social media and other sources as a quick and easy way to contribute. A pitch is usually made off of the page (perhaps in a status update or email) and the person clicks on the link, which takes them directly to that page to contribute. Most people who contribute do so after being solicited, and click on whatever link asks them to contribute. For all we know, there are tons of fake accounts out there that were sharing these links through Democratic social circles online in an attempt to collect money that way.
I doubt any of this matters, though, since you've already admitted that screwing the so-called ignorant out of their money is morally acceptable. Hell, it's the basis for your economic ideology, after all.