There's no official definition.If anything Cheap Jerseys , a slew of economic data suggests a middle cl[censored] that's actually shrinking. Mid-wage manufacturing and other jobs are disappearing due to automation and outsourcing, while lower-income positions and poverty spike higher. The White House's chief economist, Alan Krueger, said in January that the middle cl[censored] fell from 50 percent of U.S. households in 1970 to 42 percent in 2010, as more families moved to the extreme ends of income distribution.But it's not just about economic ranges. And politicians are not bound by such gauges anyway."Politicians love to use the term, because it's vague and connotes an image of regular American people." said Dennis Gilbert, a sociology professor at Hamilton College and author of "The American Cl[censored] Structure in an Age of Growing Inequality." He said, the varying uses of "middle class" on the campaign trail are "dishonest, and it's absurd."In recent months, the phrase has been popping up with increased frequency. Referring to the election as a "make-or-break" moment for the middle class, Obama used the term repeatedly in his July 9 speech calling for an extension of "middle-class" tax breaks for families making less than $250,000, or $200,000 for individuals - basically everyone but the top 2 percent. He mentioned the phrase seven times at a fundraiser Tuesday in San Antonio.Romney has suggested that the upper bounds of the middle cl[censored] include families earning $200,000. He's pushing an extension of the Bush-era tax cuts for everyone, including the wealthiest 2 percent. Romney's campaign seeks to highlight a weak economy that he says is a "kick in the gut to the middle class," with a new video this week attacking what he calls an Obama record of "political payoffs and middle-cl[censored] layoffs."Just Wednesday, Republican House Speaker John Boehner stepped into the fray with a comment that Obama "doesn't give a damn about middle-cl[censored] Americans who are out there looking for work."Responded Obama spokesman Jay Carney: The middle cl[censored] is the "prin[censored] l preoccupation" of Obama's presidency.The meaning of "middle class" has grown even harder to parse following a populist Occupy movement that for months protested high unemployment and income inequality with a rallying cry of "We are the 99 percent."Formal definitions vary, but few academics would say it covers more than 60 percent of Americans.When it comes to earnings, the Census Bureau divides household income into quintiles, or groups of 20 percent. Some economists narrowly define the middle cl[censored] as those in the middle 20 percent of the distribution, earning between $38,000 and $61,000. Others define it more broadly to include the middle 60 percent of the income distribution, between $20,000 and $100,000.Defining who is poor, by contrast, is officially more absolute. The federal poverty line is based on the minimum income needed to have what the government considers a basic standard of living. Two times the poverty line is often a cutoff for "low-income" families who may be eligible for government aid. The poverty line currently is $22,314 for a family of four Cheap NHL Jerseys , meaning that a family making $44,000 could be both "low income" and "middle class."Yet another way to gauge cl[censored] is what income tax bracket you're in. The IRS has six of them. This year, the bottom bracket sets a tax rate of 10 percent for taxable income up to $17,400 for couples. The top bracket is 35 percent, applied to taxable income above $388,350. The middle cl[censored] is commonly seen as falling in the 15 and 25 percent brackets, or couples whose taxable income is between $17,400 and $142,700. But some define it all the way up to the second-highest bracket, which is 33 percent and includes taxable income up to $388,350.Sociologists take a broader view and focus not on income, but occupation: an "upper middle class" of white-collar specialists (lawyers, engineers, professors, economists and architects); and a "middle class" of lower-level white-collar workers (teachers, nurses, insurance sales and real estate agents). Together, these groups make up about 45 percent of households and sit near the upper end of the income distribution, just behind the top 1 percent.The meanings shift more dramatically when measured by self-identification and quality of life.Few Americans label themselves as upper cl[censored] or lower class, which are seen as either pretentious or demeaning. Roughly 95 percent of adults say they are middle cl[censored] (50 percent), upper middle cl[censored] (13 percent) or working cl[censored] (32 percent), according to a Washington Post-ABC News poll conducted in May. Just 2 percent describe themselves as "better off" than upper middle class.A separate ABC News poll found that being "middle class" often meant more to people than specific income levels, which can be affected by family size, expenses and local costs of living. At least two-thirds of adults said being middle cl[censored] meant owning a home, being able to save for the future and afford things like vacation travel, the occasional new car and various other little luxuries, according to the 2010 poll.The slippery definitions have created incongruous political moments.In his January speech describing a shrinking middle class, Krueger,.