Debates and Ancient Greece

Senator McCain uses mostly forensic and deliberative of the three the rhetoric tenses.

"We can establish priorities with full transparency and intelligence..." (delibe.)
"We can attack health care and energy at the same time..."(delibe.)
"We get to work right away...."(delib.)
"There has been 5 to 6 low economic times..." (Fore.)
"Last year we lost 700 jobs in America...." (Fore.)

Senator Obama more deliberative tenses in his speeches than the other rhetoric tenses.

"Everyone of you remembers the tragedy of 9/11" (fore)
"One of the opportunities was missed by President Bush..." (fore)
"There is going to be need for energy..." (del.)
"we are going to expolore new ways to..." (del)
"Making sure that every and each one of you ..." (del.)

Source:
http://www.youtube.com/watch?v=Nla-64Vj58Q