WASHINGTON — Americans anxious about unemployment and the economy increasingly blame President Obama for hard times, a USA TODAY/Gallup Poll finds, amid signs of turbulence in November's midterm elections.

Last week's jubilant signing of the health care overhaul, Obama's signature domestic initiative, seems to have given the president little boost. Instead, his standing on four personal qualities has sagged, and 50% of those surveyed say he doesn't deserve re-election.

"People are still hurting; a lot of people are still struggling, and I think a lot of what we're seeing in the polls reflects people's views on the economy," says Rep. Chris Van Hollen, head of the Democratic Congressional Campaign Committee...