Businessman Herman Cain ties former Massachusetts Gov. Mitt Romney as the leading choice of Virginia Republicans for their presidential nomination with 21 percent each, followed by Texas Gov. Rick Perry with 11 percent, less than half his showing a month ago when he had led the pack, according to a Quinnipiac University poll released today. President Barack Obama's job approval and re-election numbers remain seriously under water in Virginia, although he is in a statistical tie with Romney and Cain, while holding a narrow lead over Perry, in general election matchups, the independent Quinnipiac (KWIN-uh-pe- ack) University poll finds. In...