President Obama is pursuing a "radical" agenda that is putting the economy and national security in peril, talk show host Rush Limbaugh told "Fox News Sunday," giving the young president failing grades across the board and standing by his sustained criticism of the administration. The conservative radio host assailed the administration for its economic stimulus package, health care reform plan and alleged uncertainty over the way forward in Afghanistan. In a wide-ranging interview, he called Obama a "child" driven by his "out-of-this-world ego." And he predicted that Obama, who built a broad-based majority over Republican candidate John McCain a year...