ATF agents search last week for evidence at the site of the fire and explosion in West, Texas. Tom Reel/The San Antonio Express-News/AP hide caption

itoggle caption Tom Reel/The San Antonio Express-News/AP

An investigator inspects the area near a surveillance camera on the roof of the Lord & Taylor store near the Boston Marathon finish line on Thursday. That camera provided the first glimpse of the men who allegedly planted the bombs. Julio Cortez/AP hide caption

itoggle caption Julio Cortez/AP

Tom Perez, President Obama's nominee to lead the Labor Department, has been an aggressive advocate for civil rights. Jewel Samad/AFP/Getty Images hide caption

itoggle caption Jewel Samad/AFP/Getty Images

FBI Director Robert Mueller is set to leave office this year. Whomever President Obama chooses to replace him could become a big part of Obama's legacy. Susan Walsh/AP hide caption

itoggle caption Susan Walsh/AP

President Obama last month withdrew the nomination of Caitlin J. Halligan to the federal appeals court in Washington, D.C., after her nomination was blocked by Senate Republicans. Jim McKnight/AP hide caption

itoggle caption Jim McKnight/AP

While equal rights occupy a large part of the debate over same-sex marriage, federal taxes are also a concern for gay couples. Experts say repealing the Defense of Marriage Act will affect some same-sex couples when they file their taxes. iStockphoto.com hide caption

itoggle caption iStockphoto.com