A campaign sign supporting Maryland Democratic Senate candidate Angela Alsobrooks was defaced with racist threats, triggering a police investigation, The Washington Post reported Monday night. “The defaced sign, which sits on a grassy median near a busy six-lane road in Prince George’s County, where Alsobrooks is county executive, had two additions in black ink: the letters ‘KKK’ near her hands and crosshairs drawn on her forehead,” reported Lateshia Beachum and Erin Cox. “Prince George’s County Police Department public information officer Brian Fischer said on Monday that police are investiga…