Piers Morgan's interview with GOP presidential candidate Rick Santorum airs tonight at 9pmET/PT, and the conversation touches on gay marriage, global warming and more. Santorum also discusses the 2012 field – including new front-runner Rick Perry. "We've seen every one of these folks who have shot to the top of the ratings end up coming back down to earth once they have to get in front of the cameras in a debate," he said. "We haven't seen Governor Perry in a debate yet, we haven't seen him really do much in the way of interviews."

Santorum contrasted that with his tactic: "I haven't backed away from any questions or any interviews...And I think that's what folks are looking for." Watch the full, contentious interview tonight at 9pmET/PT – also on the show, Oscar De La Hoya and Victor Ortiz.

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Two superstars of the boxing world – Oscar De La Hoya and up-and-coming champion Victor Ortiz – are guests on "Piers Morgan Tonight" this evening, ahead of Ortiz's fight with Floyd Mayweather September 17. "I'm sure when Victor was growing up he was watching my fights," De La Hoya told Piers Morgan. "I hoped maybe he kind of looked up to me as a boxing champion."

But that dynamic has changed: "Now that he's a champion, and now that I'm promoting, I look up to him now. When you get to know Victor, when you talk to him, you want to be like him." Check out the full interview tonight at 9pmET/PT (also on the show is GOP presidential candidate Rick Santorum). And see "24/7: Mayweather vs. Ortiz," airing now on HBO and replaying on CNN.

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Piers Morgan interviewed Wisconsin Gov. Scott Walker last night on "Piers Morgan Tonight," and the issue of unions was still at the forefront. "We had stacks of [death threats]," said Walker. "I had threats against me, against wife, against my kids." But, does he hate unions? "That's not true at all," he said.

Also on the show was Arianna Huffington, who talked about the American dream: FULL POST

Each day, we here at "Piers Morgan Tonight" put together the news you need to know – from what happened last night to what will happen today.

For August 31, 2011 – Stocks head for solid end to choppy month, FEMA almost out of money, Matthew Fox may be in legal trouble... FULL POST

One of the most powerful women in media, Arianna Huffington, is a guest on "Piers Morgan Tonight" this evening, and she talks about the 2012 GOP candidates, how AOL-Huffington Post is doing and more. She also talks jobs. "You never had that sense of urgency around job growth and the middle class," she tells Piers Morgan.

She drew a comparison to the response to Hurricane Irene: "If we had Hurricane Jobs, if we had recognition that the job crisis has brought enormous devastation in the lives of millions, and we need to come together collectively – in our neighborhoods, in our communities, at the local, state and federal level – and really solve it, everything would be transformed." Watch the full interview tonight at 9pmET/PT – also on the show, Wisconsin Gov. Scott Walker.

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Governor Scott Walker of Wisconsin is a guest on "Piers Morgan Tonight" this evening, and he talks about the 2012 GOP field. His favorites: Rick Perry and Mitt Romney. "I have a bias towards governors," he told Piers Morgan. "I think chief executives, whether it's a mayor, a county executive, a governor, all the way on up to president, I think that's been a pretty proven theory over time."

He also suggested Perry should focus on jobs: "If I'm Rick Perry from Texas, I talk about the economy every single day." Watch the full interview tonight at 9pmET/PT – also on the show: Arianna Huffington.

Boxing champions Victor Ortiz and Oscar De La Hoya are guests on Wednesday's "Piers Morgan Tonight," ahead of Ortiz's September 17 fight against Floyd Mayweather. Ortiz described his rough childhood. "It hasn't really been too easy growing up," he tells Piers Morgan. "My mother never came home. Just years gone by and I finally accepted the fact that my mom walked out."

Four years later, when Ortiz was 12, his father left as well. "It was my brother and I just roaming around like two strays," he said. Watch the full interview Wednesday at 9pmET/PT. "24/7: Mayweather vs. Ortiz" is airing now on HBO and replays on CNN.

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Piers Morgan interviewed billionaire Dallas Mavericks owner Mark Cuban on last night's "Piers Morgan Tonight," and Cuban discussed politics and the economy. "We're so inefficient in how we use funding," said Cuban of the American government. "When I'm just writing a check to the U.S. treasury it's going to waste, and that's a significant problem."

Also on the show was Newark Mayor Cory Booker, who talked about Hurricane Irene: FULL POST

Each day, we here at "Piers Morgan Tonight" put together the news you need to know – from what happened last night to what will happen today.

For August 30, 2011 – Flooding isolates Vermont communities, Gadhafi family flees to Algeria, Michael Vick signs mega-million dollar deal... FULL POST

Newark Mayor Cory Booker was a guest on "Piers Morgan Tonight" this evening, and he talked about those who say Hurricane Irene was overhyped. "I've got 99 problems and that's not one," he told Piers Morgan, paraphrasing a Jay-Z song. "Those debates to me are academic we still have thousands of people without power."

Booker also discussed the use of social media to help his residents. "Social media is a tremendous tool," he said. "I can crowd source ways I could never have done a few years ago."