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President Barack Obama has a commanding 20-point lead over Mitt Romney in Washington state, according to the latest KING 5 News poll.

The survey shows the president with 56 percent support in the state, compared to 36 percent for the GOP nominee. If that margin holds through Election Day, Obama would eclipse the vote he received in Washington four years ago.

Romney's support among key groups -- seniors, independents and men -- has eroded over the past month, the survey found. The president now has a 10-point lead over Romney among seniors 65 and older, a big jump since KING 5's survey in early September that found the two candidates nearly tied. In the Greater Seattle region, the GOP nominee's support stands at just 26 percent -- a 7-point gain for Obama since last month.

The survey results should sound an alarm for the state's Republicans, as a big lead for the Democrats' candidate at the top of the ticket could spill over to downballot races, especially the more competitive Jay Inslee-Rob McKenna race for governor.

Since Washington is not considered competitive in the presidential race, voters here aren't going to see many TV ads touting Romney. The one thing Washington's GOP can hope for is a strong showing by Romney in the three debates against the president, the first of which is scheduled for Wednesday night at 6 p.m. (Watch it live on KING 5 and KING5.com).

SurveyUSA contacted 540 likely Washington voters on KING 5's behalf from September 28 to 30. The margin of error on the presidential head-to-head was plus or minus 4.3 percent.

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