A conservative would like to see Sen Cruz, or Gov Walker (or Gov. Palin!) as the GOP nominee, but even if worse comes to worse and Bush Jr is the nominee, it is just not excusable to sit on ones hands and let Hillary or any of the candidates even further to the left win in 2016.
We will both get flamed in 3 - 2 - 1 .......
PS - let's hope and pray that one of the three you mentioned are our actual candidate - there's enough who already despise Cruz because they let their emotions rule their brains and think he would sell us down the river with H1-B increases - they are microcosms of blindered emotions running wild and trying to ensure another 8 years of a Dim in the WH so they can continue to pontificate how it's all someone else's fault - great shades of "blame Bush" that they also mock when the other side does it.