WASHINGTON (AFP) — Democrat Barack Obama has a dominant lead over Republican John McCain among Hispanic voters, despite his struggle to woo the key bloc during his presidential primary campaign, a poll found Wednesday. A Gallup survey put Obama up 59 percent to 29 percent over his rival among registered Hispanic voters across the United States. The community will likely play a pivotal role in general election swing states like Colorado, New Mexico and Florida. The poll was published as McCain made a three-day trip through Colombia and Mexico, designed to burnish his foreign policy credentials, which was also seen...