I'm a staunch conservative that has no problem with this whatsoever.
In its pure form.
My only concern is the slippery slope that could go along with this. There must be an air-tight process for this, to make sure this isn't used in any sort of sinister way. "I was just carrying out his wishes because he couldn't afford to be legally put to death," could become a common defense in murder cases.
This has to be carefully thought through. However, if a person wants to end their life because of a terminal and painful condition, who am I to stop them?