In an exclusive interview with ABC News, President Obama today acknowledged that he has made mistakes during his presidency but defended the steps his administration has taken to create jobs and improve the economy. "I second-guess constantly… I make a mistake, you know, every hour, every day," he told ABC News' Diane Sawyer, laughing. "There're always things that you're learning in the job. And I have no doubt that I'm a better president now than the day I took office just because you get more experience. But when you look at the broad outlines of what we did, had it...