Slate Group Chairman Jacob Weisberg talks with Recode's Peter Kafka about his podcast Trumpcast, which obsesses over presumptive Republican nominee Donald Trump and his following. Weisberg says Trump will leave a big mark on American politics even if he loses to Hillary Clinton in November. He also discusses how Slate has changed since it launched as a digital magazine in 1996, what social networks it is and isn't using and why media companies should be wary of Facebook's growing power.