"His $85 million is going to go into swing states. But the question is, What does he define as swing states?" said Bruce Cain, the director of UC Berkeley's Washington Center.
The campaign hopes that Palin's appeal will help energize conservatives and women -– two core constituencies in this election.
"I came to see Sara. She is so down-to-earth," one revved-up woman said. "She turned me. I was a Barack Obama fan. But when I listened to her, I thought, this women needs to be heard."
Voters are paying close attention: 37.2 million viewers tuned in to watch Palin accept the Republican nomination for vice president; 13.2 million fewer watched as Joe Biden accepted the Democratic vice presidential nomination, according to a Nielsen report.
The McCain campaign will attempt to seize this momentum to capture a margin of victory in the weeks ahead.