The latest news on polls
Obama's popularity outpaces George W. Bush's, poll says.
The Supreme Court is expected to rule on gay marriage cases in June.
About half of Americans support increase used of hydraulic fracturing, or "fracking."
Overall, more Americans believe the Earth is warming, but fewer think it's a big deal.
Expansion of solar energy topped the list of energy sources Americans want the nation to pursue.
Efforts by gay-rights opponents may have caused millions of Americans to support equality.
Republicans continue to unsuccessfully push for repeal of unpopular measure.
Younger Americans are most likely to support gay marriage, pollster says.
Party members worry that Obama could drag them down in 2014.
Republican Chris Christie performs best against Democrats, according to new poll.