Former Mississippi Gov. Haley Barbour realizes that Mitt Romney will be his party's nominee for the presidential election and is willing to do what he can to get him elected--short of formally endorsing him. "I didn't endorse anybody in 2008, and I am not going to endorse anybody this time," he told CNN. Still, Barbour is helping fundraise for Karl Rove's super-duper PAC, American Crossroads, which just launched a major media attack on President Obama.