Rick Santorum visits Jay Leno, brings extra sweater vest Tuesday night on the "Tonight Show," former Republican presidential hopeful Rick Santorum sat down with host Jay Leno and took some pretty direct jabs at his old opponent Mitt Romney, while explaining the reason he waited so long to endorse him. Appearing in his signature Santorum sweater vest, and bringing one for Leno as well, the former GOP competitor kept up with the comedy. When Leno asked about why the e-mail endorsement was sent out so late at night, Santorum joked, "We have seven kids, so we don't sleep." All kidding aside, Santorum added, "We decided to put it out late at night so it would be, sort of, the first thing people would see in the morning." He said he waited to formally endorse Romney because of "some concerns" that needed to be hashed out with the candidate first. Leno also asked Santorum about his controversial social views, including his views against contraception, pornography, and gay marriage. On the issue of contraception, Santorum maintained that birth control is against his religion, though he wouldn't support any ban on the practice. "I've never voted to stop contraception," he said. So a gay couple smoking with contraceptives would be the worst thing? Leno asked, jokingly. "Oh my gosh," Santorum laughed, "heaven forbid!" Unfortunately for the scores of Santorum supporters, the former Pennsylvania senator says he won't be running again in 2016. "We'll still have a Republican president," he said, referring to a Romney win.