While Obama can close the gap with a strong voter turnout effort, “reports from the field would indicate that not to be the case, and Mitt Romney may well be heading to a decisive victory,” says pollster Ed Goeas.

Should Romney win by 5 percentage points, it would increase Republican chances of gaining control of the Senate. His coattails would help elect GOP Senate candidates in Virginia, Wisconsin, Ohio, Pennsylvania, and Florida. “Republicans are now certain to hold the House,” Goeas said, “regardless of how the presidential race turns out.”

The poll’s election model takes into account variables including voter intensity, age, and education, and voters who are certain in their vote. The race “remains very close in the surface,” Goeas said, “but the political environment and the composition of the likely electorate favor Governor Romney.”