No one can.
Elections have consequences.
Yep. There was a large group of conservatives (including me) who sat out the Romney-Obama campaign on the grounds that Romney was not all that different from Obama. After all, Romney was just an Obama-lite.
Well, they (and I) were wrong. No way would Romney have made that prisoner swap. No way would Romney have imposed regulations meant to cripple the coal industry. The list goes on and on.
Will conservatives make the same mistake in 2016? Yes. The GOP will nominate some lightweight, due to conservative vote-splitting in the primaries. Then many conservatives will stay home in protest. Get used to President Hillary.