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I'm not all that impressed by this ... it certainly doesn't "beat Biden to a pulp." More importantly, though, it doesn't tell me that she's remotely ready for higher office.
As you well know, Sarah Palin has an image problem with the general public. The only way she's going to get out from under it, is to demonstrate that she's a serious person, with serious policies that deserve serious debate.
As political screeds go, this one is actually pretty weak --it's little more than a non-zinger that's basically a rehash of what she said back in 2008. She offers no specific details beyond what she cribbed from an Ann Coulter column.
Not remotely "presidential."