Maine's Republican presidential caucuses look like a two-man race between Mitt
Romney, the party's current front-runner, and libertarian Ron Paul in a small-state contest that has taken on new importance for Romney after his losses in three states this week.
Voting in dozens of local caucuses across Maine's 16 counties has been going on since late January. Results of a non-binding straw poll will be released by the state Republican Party around 7:30 p.m. on Saturday (0030 GMT Sunday).
Among the Republican contenders seeking to take on Democratic President Barack Obama in the November general election, only Romney, the former governor of nearby Massachusetts, and Paul, a U.S. representative from Texas, have significant ground operations that can spearhead a get-out-the-vote effort.
Maine's population ranks 41st among the 50 U.S. states, but the contest is key for Romney after he lost to former U.S. Senator Rick Santorum in Missouri, Minnesota and Colorado this week.
A win could help right the Romney ship, while a loss would be another sign that Republican voters have reservations about his conservative bona fides.
Paul held several well-attended events in Maine in late January. A rally in Freeport on a frigid day attracted an estimated 1,000 Paul loyalists and curious L.L. Bean shoppers - no small feat in a state where total votes cast in the 2008 Republican caucuses was 5,491.
Paul returns to Maine on Saturday to speak at caucus locations in three towns and an evening rally in Portland.
Romney made his first 2012 visit to Maine on Friday, staging a packed town-hall meeting in Portland. Visits to two caucus sites were added to his schedule for Saturday.
Maine encompasses everything from oceanfront estates such as one owned by former President George H. W. Bush in Kennebunkport, to remote potato farms near the state's northern border with Quebec. Obama won the state by 18 points in the 2008 election. Maine has not voted Republican in a presidential election since 1988.
Portland, the state's largest city, is only two hours from Boston and within Republican ranks is regarded as natural territory from Romney, who easily won the primary in neighboring New Hampshire a month ago.
But north and away from the coast, Maine's vast, sparsely populated wilderness areas are seen as Paul strongholds - areas where many residents have a frontier spirit and are wary of excessive government involvement in their lives.
Many of Maine's rural areas are also struggling economically. Romney, the multimillionaire former venture capitalist, has not fared well with lower-income voters in most states so far.
Maine's Republican Party has reported large, enthusiastic turnouts at its caucuses. If true, that would mark a change from other states to vote in the Republican contest, where turnout has often been below 2008 levels.
"A number of towns that have not held caucuses in several cycles have become active again, and among those towns that have caucused, attendance has increased on an average of 100 percent," said Loretta Mikols, a committeewoman in Oxford County, on the state's western border with New Hampshire.
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