Democrats have Republican friends and neighbors who are "some great people," President Obama said Thursday at a campaign rally in Ohio. But the Republican base includes a "swamp of crazy" -- people who deny climate change, espouse conspiracy theories, listen to Fox News and Rush Limbaugh. Obama said Republican politicians who "knew better" never spoke up. So "all that bile -- all that exaggeration, all that stuff that wasn't grounded in fact, just bubbled up," Obama said -- producing Donald Trump as the Republican Party's presidential nominee.