Three polls--all conducted entirely after the Democratic National Convention concluded--show the presidential race to be a dead heat.

CNN: Obama-Biden 49, McCain-Palin 48

Rasmussen: Obama-Biden 49, McCain-Palin 46

Zogby: Obama-Biden 45, McCain-Palin 47.

According to the polls, many voters still don't know enough to have a firm opinion about Palin, but Zogby notes that she boosts McCain's support among Republicans by three points, while Biden had no effect on Obama's support among Democrats. One of the many signs of Palin's popularity among the Republican base is the Obama-sized crowd of 17,000 she and McCain drew to a rally in Missouri over the weekend.

But it's not just Republicans who like Palin. Rasmussen reported Saturday that while 43 percent of voters had a favorable view of Joe Biden on the day he was picked by Obama, 53 percent of voters have a favorable of Palin:

Palin earns positive reviews from 78% of Republicans, 26% of Democrats and 63% of unaffiliated voters. Obviously, these numbers will be subject to change as voters learn more about her in the coming weeks. Among all voters, 29% have a Very Favorable opinion of Palin while 9% hold a Very Unfavorable view.