Here is an item I came across today that indicates why I believe likely voter screens are worthless:
With the election Tuesday, a whopping 4 out of 10 voters don’t even know Gov. Jerry Brown is running for another term ... on a statewide survey of 457 likely voters last week.
When a huge number so-called "likely voters" don't even know that the top seat in the election includes the sitting governor, what does it say about how they came to be "likely"? Yes the California governor's election has not received a lot of attention and Jerry Brown is coasting to re-election with nary an advertisement.
But still. When 40% of "likely" voters are this oblivious it makes you wonder what the value is in placing them into the "likely" camp when doing your polling.
Link