Lydia Saad from the Gallup Poll reports that after two months as the clear No. 1 perceived problem facing the country, unemployment/jobs dipped to No. 2 in May, while "the economy" in general moved back into the top position. At the same time, Americans grew more likely to name immigration (including illegal immigration) as the nation's most important problem, moving that issue into fifth place. Results are based on telephone interviews with 1,029 national adults, aged 18 and older, conducted May 3-6, 2010.