Mitt Romney extended his lead in Gallup’s Daily Tracking poll on Thursday. The former Massachusetts governor is up by 7 points, leading the president 52 percent to 45 percent among likely voters. Four days ago, Romney had just a 2-point lead. A separate Gallup poll showed President Obama’s job approval rating remaining at 50 percent. A new Pew poll also released Thursday shows Americans continue to give Obama a slight edge when it comes to national security issues. The survey showed 47 percent trust Obama to handle foreign policy, while 43 percent believe Romney would do a better job.