A Twitter spat between Rep. Joaquin Castro and Fox News’ Laura Ingraham escalated quickly on Wednesday — with the Texas congressman branding the conservative talking head “a white supremacist” during an exchange over conditions at migrant detention centers. ~snip~ Castro on Monday tweeted out a 10-second clip of a dingy shower at the center, which Ingraham re-posted Wednesday and described as “similar to Army facilities in Iraq I saw (and used) visiting Camp Victory & Balad.” Ingraham also charged that “@JoaquinCastrotx needs to spend more time overseas w/ our troops bef[ore] he calls this inhumane.” Castro responded three hours later,...