Obama’s standup routine drew laughs from the audience of more than 650 journalists, lawmakers, administration officials, military officials and others at the Gridiron’s 130th gathering. By tradition, Washington insiders put aside their differences for an evening of laughter, schmoozing and charity fundraising. The Gridiron Club and Foundation, founded in 1885, has drawn every president after Grover Cleveland to its annual dinner at least once. Obama made his third appearance, having attended in 2011 and 2013. Active membership in the Gridiron Club and Foundation is limited to 65 journalists based in Washington. Money raised through the dinner goes to college scholarships and journalistic organizations. Read more on Huffington Post…