Today in wavering Clinton superdelegate news.

As the endgame approaches in the Democratic nomination race, much attention falls on the undeclared superdelegates to see if they will announce for one candidate or the other.

The clearest sign that the race is coming to an end is, however, what is happening with superdelegates officially pledged to Clinton this week.

Yesterday brought news that one Clinton superdelegate had officially switched to Obama.  Today brings signs more will follow.

Barack Obama visited the House floor today, and the Politico observed his warm reception:

Politico's Amie Parnes e-mails from Obama's visit to the House floor, where he was mobbed instantly.

New York Rep. Yvette Clarke, in theory a Clinton superdelegate, asked him to autograph the cover of today's New York Daily News, with the headling "It's His Party."

Rep. Alcee Hastings, a Clinton supporter from Florida, gave him a big hug. Even Republicans were star-struck. Ileana Ros Lehtinen of Florida crossed the aisle to say hello and brought three children — in town for a school safety patrol trip — with her.

The Hill had more on Hastings's floor discussion with Obama:

"I was teasing, as everyone was. I said, ‘Do you want me to kiss the ring now, or when you come to Florida,’" Hastings said. "He said, ‘Take your time.’ I said, ‘I will take my time, because you do need to come to Florida,’" Hastings related later. "I didn't get to say what I wanted to say, which is that he could just say right now, ‘Seat the Florida delegation.’"

Now this back-slapping may simply be good manners on the heels of Tuesday's results, or it may be a public display of unity as the primary season ends.  Today's news comes on the heels of Diane Feinstein's public concerns about what the Clinton campaign is doing and this comment from Michigan-based Clinton superdelegate Dale Kildee:

"I urge her to take the day off and think very seriously about doing what’s best for the country and best for the party," said Kildee.

He added, "I got straight A’s in math," implying that Obama’s delegate lead is impossible for Clinton to overcome in the few primaries left.

It appears that Joe Andrew's firm declaration last week that it is time for Clinton supporters to rally around Obama is loosening Clinton's grip on superdelegates who have been securely in her camp for months.  What these previously committed superdelegates do in the hours and days to come may have the most influence on when this nomination battle officially ends.

So far today, Senator Obama has been warmly greeted by Clinton superdelegates from New York and Florida.  What's coming next?

UPDATE: No new waverers, but an update on Senator Feinstein's comments.  She's given Clinton her steady support, but note the conditional last sentence:

Feinstein talked with Clinton via phone this morning and erased any doubts about her own commitment to the campaign and that of the candidate. "I'm sticking with her, absolutely," she told reporters. "Her strategy is to win this. And she's entitled to her opportunity to try."

The California senator said she heard "conviction" in Clinton's voice during their conversation. "She feels she owes a deep debt of gratitude to the people that support her -- who support her intensely."

Feinstein said Clinton would drop out of the race "if the time comes. She doesn't believe it's the time. And she's going to continue on."

"I agree that she should take this for as long as she feels she has a chance to win it," Feinstein added. "And she says she will do nothing that causes the party any difficulty."

Given the abject race-baiting of the Clinton campaign today, I wonder if any reporters want to follow up with Sen. Feinstein on that statement.