President Bush and opponent Sen. John Kerry will face off for the third and final time at 9 p.m. tonight in Arizona State University's Gammage Auditorium.
The candidates will discuss domestic issues through questions presented by a moderator in a set-up similar to the first debate.
Matt Beckmann, a professor of political science at the University of California-Irvine, said he hopes the candidates will come out with their plans for the future.
"If you're elected, what will you do first?" he said.
Beckmann said it is hard sometimes to get that information because the candidates are so well rehearsed on what to say and what phrases work best.
But he added that not being specific can be helpful for the candidates, as long as they get the basic idea across to the viewers.
During the last month of campaigning, he said it is the candidates' job to explain their positions and the voters' civic duty to find out more.
Experts have varying opinions on who will leave tonight's debate on top. Some say the setting favors Kerry, but others say Bush could shine through.
"If it is set up like the first debate, the advantage is for Kerry," said Joel Aberbach, a political science professor at the University of California-Los Angeles.