WASHINGTON - Over two decades, the income gap has steadily increased between the richest Americans, who own homes and stocks and got big tax breaks, and those at the middle and bottom of the pay scale, whose paychecks buy less. The growing disparity is even more pronounced in this recovering economy. Wages are stagnant and the middle class is shouldering a larger tax burden. Prices for health care, housing, tuition, gas and food have soared. The wealthiest 20 percent of households in 1973 accounted for 44 percent of total U.S. income, according to the Census Bureau (news - web sites)....