 But his campaign manager, Jen O'Malley Dillon, tells MSNBC. We believe on this campaign we are built for the close election that we are in, and we see the path forward. The president is the leader of our campaign and of the country, and he is clearly, in our impression and what we've built and in our engagement with voters, he is the best person to take on Donald Trump and prosecute that case and present his vision versus what we saw last night.