WASHINGTON — President Barack Obama’s endorsement of gay marriage appears to have made Americans on both sides of the issue even more entrenched in their positions, firing up his young, liberal backers and intensifying opposition from Republicans and conservatives, according to a new poll.

Overall, his announcement last month that he supported gay marriage did little to shift the nation’s views on the subject, with the country remaining evenly divided on it, the Associated Press-GfK survey found. And people still seem to favor him over Republican presidential rival Mitt Romney when it comes to handling social issues.

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