HOWARD SCHNEIDER HOUSEHOLD cash is near record levels in the United States, and consumers are using it to pack restaurants and aeroplanes and buy new cars. Jobs are there for the taking. Net worth is 30% higher than before the pandemic, more so for those in the bottom half. And people have soured on President Joe Biden despite all of that. Midterm elections on Tuesday could hamstring the Democratic president with a Republican-controlled Congress, and opinion polls and public sentiment surveys suggest that a gloomy mood around economic issues is pushing voters in that direction. It is a fact of…