From Ballot Access News:

For the second year in a row, the Maine Green Party has received more revenue from the state’s income-tax check-off choice for political parties than the Maine Republican Party received. State income tax returns that have been sent in during 2007 yield $12,146 to the Democratic Party; $4,467 to the Green Party; $4,349 to the Republican Party.Twelve states let state income taxpayers choose to send a small donation to the political party of their choice, although in Ohio and North Carolina, only the Democratic and Republican Parties are ever listed (even when there are other ballot-qualified parties).