Clinton's 2016 White House launch contrasts with her 2008 bid

(Reuters) - Hillary Clinton cast herself as a champion for everyday Americans on Sunday, kicking off her long-awaited second run for the White House with a vow to fight for a level playing field for those recovering from tough economic times.

Clinton, who begins the 2016 presidential race as the commanding Democratic front runner, entered the fray with a flurry of video, email and social media announcements that indicated she had absorbed some of the lessons of her painful 2008 loss and would not take anything for granted this time.

When she lost the Democratic nominating battle to Barack Obama, her campaign was heavily criticized for conveying a sense of arrogance and entitlement, and for being out of touch with the party's progressive wing.

This time, the video launching her campaign portrayed her as a warmer, more empathetic figure and laid the groundwork for a more populist economic agenda.

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