Unforgivable. If people have issues with a candidate, they should address those issues, not engage in hate and slander. I was very disappointed by many of those posts and I hope I never see that kind of attack again.
Free Republic has honestly examined the strengths and weaknesses of very candidate and although it is a painful process for supporters, it has been good for the process.
Some people can handle this vetting better than others because some can not face flaws being exposed in the candidates they support. To them, the person has to be perfect...and that is impossible. The lessor of two evils is as much a promise in politics as is the natural law of imperfect men.