Not so fast – while I agree with @pmario about the tooltip, previewing links is a good thing. Without it, a user MUST click to see the content. With a long list, that could be very tedious.
Proposal…
You have enough room to the right of the list (even more room if you remove some of the left margin) to place a dedicated area to show a preview on hover. Use CSS to show an always present, abbreviated copy of the content, only revealed on hover.
EDIT: not possible – For touch devices, use long-press (or whatever they’re calling it).
Make sure to subdue the preview rendering (perhaps using opacity and/or low contrast text) implying it’s nothing more than a courtesy rendering, not for editing and navigation purposes. And my preference, very subdued borders around it.