(CBS NEWS) --Despite his campaign having run "a whole slew of positive ads" this cycle, President Obama suggested to "CBS This Morning" co-anchor Charlie Rose, in an exclusive interview, that he's gone negative in his speeches to highlight the "sharp contrast, probably as sharp a contrast as we've seen, philosophically," between himself and presumptive GOP nominee Mitt Romney.
In a clip that first aired Monday on "CBS This Morning," President Obama defended himself from mounting criticism of his campaign's negative attack ads against Romney - particularly on the subject of his time at the private equity firm Bain Capital - arguing that "politics are about choices."
But while Mr. Obama views Romney as "a patriot" and loving family man, he said, "he has a particular theory of how to grow the economy that has to do with providing tax cuts for folks at the very top, eliminating all regulations, and somehow that is gonna generate solutions to the challenges we face.
"I've got a very different approach," he continued, "And the more detailed we get into what he's saying and what I'm saying, I think that serves this democratic process well."
"Because politics are about choices?" Rose asked.
"Politics are about choices," the president responded.