PRINCETON, NJ -- Thirty-five percent of Americans name unemployment as the most important problem facing the U.S., the highest percentage since the economic slowdown began and higher than at any point since October 1983 (41%). Unemployment is the most important problem for the second month in a row, with the economy ranking second and healthcare third.From the beginning of the economic slowdown through 2009, mentions of "the economy" in general were consistently the top issue. In the past year, ...