This is what PPP should have asked:
In the election for US Senate will you vote for Democrat Scott McAdams, Republican Joe Miller, or someone else? If Scott McAdams, press 1. If Joe Miller, press 2. If someone else, press 3. If you're undecided, press 4.
26% McAdams
35% Miller
35% Someone Else
4% Undecided
(For those who said "someone else" in the first question:) Are you planning to vote for nonaffiliated candidate Tim Carter, nonaffiliated candidate Ted Gianoutsos, Libertarian Fredrick Haase, or are you going to write in some candidate? If Tim Carter, press 1. If Ted Gianoutsos, press 2. If Fredrick Haase, press 3. If you're going to write in the name of a candidate, press 4, enter their name using your telephone keypad, followed by the pound sign.
Murkowski = 687569754
That requires a lot more effort than writing in a name on a ballot. A lot of people are unfamiliar with the locations of letters on their phones, especially elderly people with poor vision.
Edit: If they had reading glasses, they would bring them to the voting booth, but they probably wouldn't use them to answer the phone.