U.S. President Barack Obama leads presumptive Republican nominee Mitt Romney 50-43 among registered voters nationwide, a poll released Thursday found. snip Obama is favored by 88 percent of Democrats while 89 percent of Republicans favor Romney, who leads among independent voters 46 percent to 45 percent for Obama. The poll found 34 percent of Romney backers said they support him strongly, while 64 percent of Obama voters said they support him strongly. snip Unemployment remains the No. 1 issue for voters overall. Forty-six percent said they favored Romney on the issue, and 42 percent favored Obama. However, Romney has gone...