Conservative radio host Glenn Beck apologized for claiming that Republican presidential candidate Donald Trump had voted for President Barack Obama in 2012 and 2016, saying he'd been duped by a fake tweet.Beck was a guest on Fox News' "The O'Reilly Factor" last week, making a case for why he thinks "progressive" Trump would be as big of a "monster" as Barack Obama – a case he's been making for many months.Trump watched and responded to the show with a slew of unpleasant opinions about "dopey" Beck to a New Hampshire crowd.When Trump denied ever having voted for the president Beck tweeted: Why do you keep...