A senior official in the US Education Department stepped down on Wednesday, citing President Joe Biden’s handling of the conflict in Gaza, the latest sign of dissent in the administration as deaths continue to grow in the war. Also on Wednesday, 17 Biden re-election campaign staffers issued a warning in an anonymous letter that Biden could lose voters over the issue. Tariq Habash, special assistant in the Education Department’s Office of Planning, Evaluation and Policy Development, in a letter to Education Secretary Miguel Cardona, said: “I cannot stay silent as this administration turns a bli…