There are glimmers of hope for Democrats battling to retain control of Congress in this fall's elections, with the party holding a slender edge in public trust for shepherding the economy and small gains in those saying their finances are healthy, according to a new poll. The reeling economy remains the American public's top concern, according to an Associated Press-GfK Poll conducted earlier this month, making public attitudes about it crucial for both parties' hopes in November. The good news for Democrats: By a slim margin (47% to 42%), people trust them more than Republicans to guide the economy. And...