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President Barack Obama and Republican challenger Mitt Romney will take to the stage Tuesday night for their second presidential debate, and ABC7 News and React Labs are teaming up for our third installment of Instant Reaction.

Using the Instant Reaction mobile app, you can interact with what the candidates are saying in real time on your smartphone and watch the reactions of every participant on a chart on WJLA.com.

Instant Reaction is a three-screen experience - we want you to watch the debate at 9 p.m. on ABC7, vote in our poll using your smartphone and watch everyone's reactions on your home computer. Here's how to get involved:

1) HOW TO REACT ON YOUR PHONE: Using your iPhone, iPad or Android device (or compatible browser), log on to www.wjla.com/react. Answer a few short questions, then tap Agree, Disagree, Spin and Dodge while you watch the debate.

2) TO WATCH THE REACTIONS FROM YOUR COMPUTER: From your computer, log on to www.wjla.com/chart using Google Chrome, Firefox or Safari (Internet Explorer is not supported). From there, you can watch the real-time reactions of every Instant Reaction participant.

3) Once the debate starts, react as much as you'd like! You can agree or disagree with the candidates, indicate that they're spinning or cry out that they're dodging questions.

The 2012 presidential election is coming down to the wire, and President Barack Obama and GOP challenger Mitt Romney are set to square off once again Tuesday in their second of three presidential debates.

Tuesday night's debate will take place at Hofstra University in Hempstead, N.Y. and will take on a town hall-style format. The candidates will be grilled by undecided members of the voting public on domestic and foreign policy issues.

Obama's campaign, seeking to rebound from a dismal first debate, promised a more energetic president would take the stage Tuesday at Hofstra University in Hempstead, N.Y. Romney's team aimed to build on a commanding opening debate that gave the Republican new life in a White House race that had once appeared to be slipping away from him.

Click here to check out how all of our participants reacted to the first Obama/Romney debate!

The Associated Press contributed to this report.