(Bloomberg) -- After two gruesome mass shootings in a 24-hour span, some Republicans are raising alarms that their opposition to new firearm limits is making the party toxic to the suburban women and college graduates who will shape the 2020 election.“Republicans are headed for extinction in the suburbs if they don’t distance themselves from the NRA. The GOP needs to put forth solutions to help eradicate the gun violence epidemic,” said Dan Eberhart, a Republican donor and oil-and-gas executive who supports President Donald Trump.Last year, Eberhart said, he was having lunch with Rick Scott when the then-Florida governor learned of the massacre unfolding in Parkland. It marked the deadliest high school shooting in U.S. history, as a gunman used an AR-15-style rifle to kill 17 people. Eighteen months later, as the country reels from killing sprees in El Paso, Texas, and Dayton, Ohio, Eberhart said it’s time to join Democrats and majorities of Americans who want to ban those types of gun...