Which controversies increased public attention around Glenn Beck?

Glenn Beck's shift from a comedian to a fiery political commentator sparked major public attention, especially after he called President Obama a racist on Fox News in 2009, which led to a massive advertiser boycott. His "Restoring Honor" rally at the Lincoln Memorial in 2010, timed with Martin Luther King Jr.'s "I Have a Dream" anniversary, drew huge crowds and even more criticism for its political tone, making him a lightning rod in talk radio history.