Different styles in presidential campaign debating

NEW YORK (FOX 5 NEWS) - With many Americans still unsure about where the presidential candidates stand on some major issues, Hillary Clinton and Donald Trump's talking points Monday are important. But so will how they deliver their thoughts and what they look like doing it. 

David Birdsell, dean of the Baruch College School of Public Affairs, says optics are key.  

Examples of the details influencing public opinion include Richard Nixon's sweaty upper lip and shifty eyes while debating John F. Kennedy, Al Gore's exasperated tone and sighing on stage with George W. Bush, and John McCain's apparently aimless wandering during a debate with Barack Obama.

So how significant is tonight's debate?  Well the pew research center found that approximately two-thirds of voters have said that debates do impact their decisions on Election Day. And with so much at stake, every little subtlety counts.