Just because we all sin does not mean we turn a blind eye to sin. For many people Newt's personal lack of self control and repeated unfaithfulness is cause for concern on how they as his voters will be treated after the election is all done.
Attacking someone over those concerns is not going to make them go away.
You have a sovereign vote, for now. Use it as you see fit, but don’t try to use the left’s accusation to herd conservatives into shutting up and letting the left run the show just because they ‘claim’ hypocrisy. I claim forgiveness ... and my God is bigger than the father of lies who is the accuser of the brethren. Inviting people to wallow in self-righteousness is not a winning strategy, IMHO.