Seeking to exploit Congress's abysmally low approval ratings, President Obama is urging voters to tell their lawmakers they must compromise for the sake of the country. In his weekly radio and Internet address Saturday, Obama said people are frustrated by the partisan gridlock in Washington, especially after the brutal fight over increasing the nation's borrowing limit that didn't prevent the U.S. debt from being downgraded. Obama tried to position himself on the side of the public and against a deeply unpopular Congress. But even though Obama's approval ratings aren't so good either, he clearly sees a need to direct the...