A lopsided 84 percent of adults would like to see the establishment of a federal standard for background checks for people buying guns at gun shows, the poll showed.

Three-quarters of Americans said they reacted to the Connecticut massacre with deep anger, while 54 percent said they felt deeply ashamed it could happen in the United States.

President Barack Obama was set Wednesday to unveil a wide-ranging package of steps for reducing gun violence, expected to include a proposed ban on assault weapons, limits on the capacity of ammunition magazines and universal background checks for gun sales.