PRINCETON, NJ — Hispanics’ approval of President Barack Obama’s job performance slipped to 57% in May, after falling from 69% in January to 64% in February. By contrast, whites’ and blacks’ approval of the president has been steady throughout 2010. These trend figures are based on monthly averages of Gallup Daily tracking for 2010, including interviews with approximately 1,000 Hispanics each month. The two major drops in Hispanics’ approval of Obama this year — in February and May — coincide with two periods when the president was under fire for not doing enough to promote comprehensive immigration reform in Congress.