Sen. Barack Obama has narrowed Sen. Hillary Rodham Clinton's lead among the superdelegates, who will end up deciding the Democratic nomination.

Clinton has 274.5 to Obama's 268, according to the campaigns.

Obama has gained three times as many superdelegates as Clinton since March 4.

The 795 superdelegates aren't bound by the results of primaries and caucuses. Obama has the lead in pledged delegates awarded in those contests, 1,588 to Clinton's 1,425, according to an unofficial count by the Associated Press.

A candidate needs 2,025 delegates to win the nomination.

Those figures don't include Florida and Michigan, which were stripped of their votes by the national party organization for holding early primaries.