Independent Angus King, candidate for a U.S. Senate seat in Maine, has been criticized by candidates from the Republican Party. Republicans are upset because King contributed to the Democratic National Committee and to President Obama’s reelection campaign.

King has yet to say if he wins the Senate race, which party he would caucus with. However, he purchased two tickets to a fundraiser dinner for Obama that was held in Portland February 21. That was a week prior to Olympia Snowe’s announcement that she would not be seeking reelection in November.

A spokeswoman for King said on Wednesday that he purchased the two tickets in a single transaction that was later divided into $4,000 for the Obama campaign and $6,000 for the Democratic National Committee.

One of King’s rival’s Rick Bennett a Republican, posted on his website a shot of the transaction regarding King’s donation with a statement that read. “Angus King, an independent gave the DNC $6,000 the day after Snowe announced she was retiring, How come?”

On Tuesday, Charlie Summers another Republican candidate said King had contributed over $20,000 in the last year to the DNC and the Obama campaign, while still claiming to be independent.

King is the former Governor of Maine and has been a supporter of Obama. He made just $11,000 in political contributions over the past election cycle according to filings with the Federal Election Commission.

Besides the $10,000 he contributed with two tickets to the fundraising dinner for Obama, King contributed $1,000 to the Obama campaign September 29.