Your impression is based on mainstream media clips played to convey the impression you have described. The stalkers chant and try to drown her voice out at rallies, forcing her to raise her voice to the shrill level any woman’s voice reaches when trying to be heard over a cacaphony. This is a tactic being used by PDS sufferers.
Nah, ya can't blame everything on the liberals. Sarah just happens to have a high pitched, shrill voice. And it gets worse when she thinks she has to excite the troops to a high level by shouting at them. All she needs to do is stay calm and keep the mic close to her mouth. She also needs to have a powerful speaker system that will drown out the liberal drones. At this point in her career she'd be a much more effective force for conservatism if she'd just continue hammering Obama and backing the conservative agenda. Until she can eventually back a candidate and get votes for him. Sarah can garner many votes for the right person, but she is not that person, not yet anyway.