A Washington state victory in hand, Mitt Romney is pushing ahead to Tuesday's 10-state bonanza that features contests from Alaska to Ohio to Massachusetts.
They also will feature millions in spending and the largest single day of voting yet in the Republicans' topsy-turvy presidential primaries.
The former Massachusetts governor won Saturday night's low-turnout caucuses, adding another win to his tally.
Leading in delegates to the GOP's national convention, Romney looks to defend his front-runner standing even while rivals Rick Santorum, Newt Gingrich and Ron Paul are seeking to keep their candidacies afloat.
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