Republican Allan Fung leads each of his potential Democratic rivals in the race for Rhode Island’s 2nd Congressional District, a new Boston Globe/Suffolk University poll found, giving the GOP its best chance to flip a seat that has been held by Democrats since 1991. The survey of 423 likely general election voters in the race to succeed retiring US Representative James Langevin shows Fung’s lead over each of the six potential Democrats nominees – state Treasurer Seth Magaziner, Sarah Morgenthau, David Segal, Joy Fox, Omar Bah, and Cameron Moquin – is fueled by strong support from voters who identify as...