But what do you do when sticking to your principles does more harm to the cause to you want to further than, in your opinion, abandoning the will?
You have it exactly backwards.
A vote for Rudy will do more harm than voting for anyone else during the Primary.
A vote for Rudy, rather than a vote for an alternative Pro-Life candidate, and yes there will be one available if Rudy is the candidate, will also do more harm.
Rudy garauntees a Hillary victory and the destruction of the Republican Party and the conservative movement within the party.
I think this is where many miss the point. The cause is not keeping Hillary from the White House, nor is the cause low taxes. The cause is Christ and His kingdom! That kingdom loves and protects children, even before they are born, it prevents one man from using the tax code to steal from his neighbor, it prescribes the jurisdictional limits of the civil magistrate, and it creates civil consequences to limit the wicked acts of fallen man. The people of Christ have been preserved, purified, tested and strengthened under hostile rulers in the past. But they have never flourished when they have compromised Christ. The kingdom is advanced when the people of Christ overcome by the blood of the lamb, the power of their testimony and do not love their own lives unto death.