BATON ROUGE, Louisiana — Deep in the heart of the conservative South, Louisiana’s voters re-elected Democratic Gov. John Bel Edwards to a second term, shocking Republicans who had hoped to reclaim the seat on the strength of President Donald Trump’s popularity. With his focus on bipartisan, state-specific issues, the moderate Edwards cobbled together enough cross-party support Saturday to defeat Republican businessman Eddie Rispone, getting about 51 percent of the vote. Trump fought to return the seat to the GOP, but his intense interest in the race not only motivated conservative Republicans, but also powered a surge in anti-Trump and black voter turnout that helped boost Edwards over the finish line. Coming after a defeat in the Kentucky governor’s race and sizable losses in Virginia’s legislative races, the Louisiana result seems certain to rattle Republicans heading into the 2020 presidential election.