Barack Obama and Hillary Clinton have each picked up more superdelegates today.
Congressman Bruce Braley of Iowa will announce his endorsement of Obama later today. Braley had supported John Edwards, and had stayed uncommitted since Edwards dropped out of the race at the end of January.
UPDATE: Congresswoman Lois Capps of California, who has ties with the Clintons, also endorsed Obama.
"This wasn't an easy decision for me," Capps said in a statement provided by the Obama campaign. "Democrats were blessed this year with many talented and capable candidates, and I believe both Sen. Clinton and Sen. Obama would make fine presidents. But Sen. Obama's proven judgment, his hopeful vision for America, and his unmatched ability to motivate millions of Americans eager for change made the choice for me.
"I have enormous respect for Sen. Clinton. She is smart, dedicated and a champion of those often underserved and forgotten. She has a remarkable record of achievement that inspires us all. And her election would fulfill a life long dream for so many of us who have been fighting for women's rights. She would make a great president. But for me, Barack Obama is the best choice."
Meanwhile, Clinton received the backing of Pennsylvania AFL-CIO leader Bill George.
"Hillary Clinton has the strength and experience to jumpstart the economy and rebuild the middle class," George, a Democratic National Committee member, said in a statement provided by the Clinton campaign. "Working families in Pennsylvania overwhelmingly favored her in last week’s primary, and I feel that she is our strongest candidate to carry Pennsylvania in November and win back the White House."
UPDATE: Her campaign also said that Luisette Cabanas, an unpledged superdelegate from Puerto Rico, is endorsing Clinton.
"Today I endorse Hillary Clinton for President because of her strong win in Pennsylvania," Cabañas, party vice chairman in the US territory, said in a statement issued by the Clinton campaign. "She has shown a firm conviction and the character needed to lead the nation. Her proposals for Puerto Rico, particularly those related to healthcare, are the best by far of any candidate in history."
She is clinging to a narrow lead among superdelegates, the elected officials and party leaders who will likely determine the Democratic nominee, though Obama has won the majority of the ones who have declared since Super Tuesday on Feb. 5.
Fewer than 300 of the 800 or so superdelegates remain undeclared.
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Glen Johnson is Politics Editor at boston.com and lead blogger for "Political Intelligence." He moved to Massachusetts in the fourth grade, and has covered local, state, and national politics for over 25 years. E-mail him at firstname.lastname@example.org. Follow him on Twitter @globeglen.