Idaho’s last Democratic superdelegate to endorse a presidential candidate has announced his support for Sen. Barack Obama.

Keith Roark, the Idaho Democratic Party’s chairman, announced on Monday that he is backing Obama because he feels the Illinois senator will make a better president, run better against the Republican’s presumptive nominee, Sen. John McCain, and run a stronger campaign in Idaho.

Superdelegates are not bound by primary and caucus votes and help pick party nominees. With this year’s tight race between Obama and Hillary Clinton for the Democratic nomination, superdelegates are likely to play a strong role in choosing the nominee.

Idaho has five superdelegates; four are backing Obama and the fifth will be chosen at the Democrats’ state convention in mid-June.