The latest nationwide survey, begun Friday afternoon after the McCain announcement of Palin as running mate and completed mid-afternoon today, shows McCain/Palin at 47%, compared to 45% support for Obama/Biden.

In other words, the race is a dead heat.

The interactive online Zogby survey shows that both Obama and McCain have solidified the support among their own parties - Obama won 86% support of Democrats and McCain 89% of Republicans in a two-way head-to-head poll question not including the running mates. When Biden and Palin are added to the mix, Obama's Democratic support remains at 86%, while McCain's increases to 92%.

After the McCain "Veep" announcement on Friday, Palin was almost immediately hailed as a strong conservative, and those voters have rallied to the GOP ticket, the survey shows. Republicans gather in St. Paul, Minnesota this week to officially nominate McCain and Palin as their presidential ticket.

Overall, 52% said the selection of Palin as the GOP vice presidential nominee helps the Republican ticket, compared to 29% who said it hurt. Another 10% said it made no difference, while 10% were unsure. Among independent voters, 52% said it helps, while 26% said it would hurt. Among women, 48% said it would help, while 29% said it would hurt the GOP ticket. Among Republicans, the choice was a big hit - as 87% said it would help, and just 3% said it would hurt.

Pollster John Zogby: "Palin is not to be underestimated. Her real strength is that she is authentic, a real mom, an outdoors person, a small town mayor (hey, she has dealt with a small town city council - that alone could be preparation for staring down Vladimir Putin, right?). She is also a reformer."