Miami-Dade County Was Once a Lock for Democrats. Not Anymore. Republicans could flip Florida’s most populous county, a “massive warning sign” for Democratic Party leaders. Author: PATRICIA MAZZEI Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to email a link to a friend (Opens in new window)Click to print (Opens in new window)MoreClick to share on LinkedIn (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Tumblr (Opens in new window)