Republican presidential nominee Mitt Romney shakes hands with President Barack Obama at the start of the first 2012 U.S. presidential debate in Denver October 3, 2012. REUTERS/Jason Reed Candidates come out swinging Romney’s ‘binders full of women’ stumble Moderator Candy Crowley becomes part of story Mitt Romney closing gap in Ohio Bruce Springsteen to campaign for Obama Obama vs. Romney: Round 2 What to expect at the presidential townhall

Here is a look at U.S. presidential debates as Democratic President Barack Obama and Republican nominee Mitt Romney go head to head for their second debate tonight.

Obama gave a lackluster performance in the first debate on the economy earlier this month and it effectively lost him his earlier lead in the polls. The third and final debate is on October 22.