As President Obama tries to persuade a reluctant Congress to pass new gun laws, the poll found that a majority of Americans — 54 percent — think gun control laws should be tightened, up markedly from a CBS News poll last April that found that only 39 percent backed stricter laws.

The rise in support for stricter gun laws stretched across political lines, including an 18-point increase among Republicans. A majority of independents now back stricter gun laws.