Jon Tester

Much has been said about Sen. Ben Cardin's meetings at Democratic National Committee Headquarters in Washington over the past few days.

Multiple sources say that he and his fellow undeclared Senators will meet there again to announce their support for Barack Obama, who became the party's presumptive nominee tonight.

One of the Senators who took part in the Cardin talks, Jon Tester, pre-emptively announced his support for Obama tonight on MSNBC.

Meanwhile, the Huffington Post reports that Sen. Barbara Mikulski was on Sen. Hillary Clinton's call-sheet today.

Following a meeting held yesterday with Senators Tom Harkin, Jon Tester, Tom Carper and Ken Salazar, the Rocky Mountain News reports that Sen. Ben Cardin (D-Baltimore) is set to attend another, larger gathering of the Senate's undeclared Democratic superdelegates.

The meeting will not take place until Wednesday, implying that Cardin's endorsement will likely not come tonight. Yet Harkin, who allegedly brought the group together, told the paper that he is unsure whether the group will end up voting as a block.

This all may change, as an AP newsflash reports that Hillary Clinton campaign officials say the Senator will acknowledge that Sen. Barack Obama has enough delegates for the nomination during her New York speech tonight.

Two takeaways from today's superdelegate happenings:

1. It looks like House Majority Whip James Clyburn will endorse Barack Obama tomorrow, sans leadership partners Steny Hoyer and Nancy Pelosi -- despite a claim that was attributed to him.

2. Ben Cardin and fellow undeclared Senators Jon Tester, Tom Carper and Ken Salazar were summoned by elder colleague Tom Harkin to the Democrats' D.C. headquarters for a discussion on whether they should endorse or not. Obama won the contests in all of their states. Afterwards, Cardin was quoted at length by CNN.