ABC News poll shows:
When asked if the veep candidate has the right experience to serve effectively as president, 42% of respondents say yes, 50% say no.
When asked the same question about Biden, 66% say yes, 21% no.
And/But: 50% of all voters view Palin favorably.
HALPERIN’S TAKE: The 18 ways Sarah Palin can help McCain close the enthusiasm gap.