Mario Gabelli, GAMCO Investors, talks with "Squawk Box's" Becky Quick about Warren Buffett's acquisition of Precision Castparts. He added a powerhouse to his lineup, says Gabelli. Also Gabelli reveals what he would like to target next. I'd like to hold water infrastructure. And Gabelli shares his thoughts on AutoNation and the recent media frenzy, including Comcast's bid for DreamWorks.