WASHINGTON (CNN) - Sen. Hillary Clinton's superdelegate lead over Sen. Barack Obama was narrowed even more Saturday, according to CNN's latest delegate estimate.
Clinton picked up the votes of two more superdelegates and lost one since Friday night.
Rep. Ciro Rodriguez of Texas announced his support for the New York senator.
Arthur Powell was named an add-on superdelegate by the Massachusetts Democratic Party on Saturday and said he would vote for Clinton.
Obama, meanwhile, picked up three superdelegates since Friday night, including Carole Burke and Kevin Rodriquez of the Virgin Islands.
Rodriquez had backed Clinton but decided to switch his endorsement, citing Obama's ability to unite the Democratic Party and win the White House, according to Obama's campaign.
Kristi Cumming, named an add-on superdelegate by the Utah Democratic Party late Friday night, said she will vote for Obama.
That brings Clinton's superdelegate total to 273 and Obama's to 271.
Superdelegates are Democratic officials who hold the balance of power in determining the party's presidential nominee.