New York ? Half the respondents of a new poll say taxing the richest Americans by at least 50 percent is a great idea, while more than a third consider Twitter a fad that will likely fade.

Those are among the findings of a new “60 Minutes”-Vanity Fair Poll released Sunday.

Nearly half of the respondents chose Wal-Mart as the institution that best symbolizes America today, leaving in the dust runners-up Google, Microsoft, the NFL, and the banking and securities firm Goldman Sachs.

Dining out was chosen most often by respondents as a luxury they hate sacrificing in these tough economic times. And 5 percent thought the best way to fight obesity among patrons of fast-food chains is to equip each restaurant with scales for them to weigh themselves.

A politician taking bribes is considered by far the greater sin (chosen by 37 percent of the respondents) when stacked against extramarital affairs (just 2 percent).

Obama was edged out by George Clooney (24 percent to 26 percent) among respondents choosing “which man they would most like to trade places with for a week,” followed by Tom Brady and Bruce Springsteen.

But among woman, First Lady Michelle Obama was the favorite, chosen by 26 percent, with Secretary of State Hillary Clinton picked by 16 percent, actress Angelina Jolie by 13 percent and singer Beyonce selected by 12 percent.