On almost every issue, Hilary is going to do what Rand Paul would do, with the exception of ending and/or at least modifying 1. the drug war, 2. US empire abroad and relationship with Israel, 3. NSA.
On those 3 things Rand Paul has a much much better reputation/past on than Hilary (whether or not he'll flip flop is another issue, I'm talking purely on how he talks vs. how she talks about these policies). Hilary will not only keep all of that intact, but likely make it worse, with the exception of marijuana legalization which is likely too far to go back on now.
The right stays winning because they have a radical insurgency (tea party) which does not compromise and cares more about ideology than pragmatism. This is something the left desperately needs if people are serious about ending the slew of fucked up shit in this country. Electing Hilary would reinforce all of that fucked up shit and reward democrats for moving further and further right.
As for Bush, IMO that era proves my point as far as long term tactics go. Were the democrats not overwhelmingly voted in after the republicans imploded? Were the liberals not more radical against Bush? They were. If a democrat was doing the things Bush did, liberals wouldn't say shit because it's a democrat, Obama is proof of this. If a republican does it, suddenly liberals grow a backbone again.
Hilary is going to be right wing, people are foolish if you think otherwise. So it's either Hilary with 70% right wing/30% centrist, or Rand Paul who's also mostly right wing but a few areas that are decidedly leftist. When the libertarian crew fucks up the economy even more, there will be an angry and organized left (like during end of Bush years), to elect democrats again. I don't like the democratic party but if they're the only force on a national level then it must be brought back to an economically populist, left-wing stance. Electing Hilary will not do this at all, it's rewarding the worst elements of the party.
All that being said, Paul is the only right winger I'd be in favor of over Hilary, because of his few leftist positions. Any other republican would undoubtedly be worse. The worst possible outcome would be Hilary vs. Bush. Like I said before, I hope Sanders runs but I have no doubt liberals will shit on him for very sad misguided reasons.