Mitt Romney has won a double-digit victory in Washington state's Republican presidential caucuses.
It's his fourth campaign triumph in a row and a fresh show of strength in the run-up to the 10-state Super Tuesday contests next week.
Rick Santorum and Ron Paul are battling for second place in the Washington state caucuses, while Newt Gingrich is running a distant fourth in the state.
Returns from 43 percent of the state's precincts show Romney with 37 percent of the vote. Paul and Santorum each have 24 percent. Gingrich is drawing 11 percent.
A total of 40 delegates are at stake.
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