Dozens of people crossed the Mexican border into California Tuesday in the latest such action by immigrants challenging the Obama administration’s record deportations. The crossing was led by Elvira Arellano, a woman who made national headlines when she spent a year inside a Chicago church with her son, seeking refuge from deportation. She was deported in 2007. Arellano re-entered the U.S. on Tuesday with her two children and was taken into detention. Many participants in the protest were young people known as “DREAMers” brought to the United States as children.