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WASHINGTON, D.C. (CBSMiami/AP) — Speculation surrounds Massachusetts Sen. Elizabeth Warren as a possible running mate for Hillary Clinton in the race for the White House.

Warren arrived Friday to Clinton’s Washington home for their first meeting since Warren endorsed the presumptive Democratic nominee.

Clinton is in Washington for a speech to Planned Parenthood. Warren was in town for a rare Friday session in the Senate.

Warren threw her support behind Clinton Thursday night, following President Barack Obama. On Thursday, she offered a blistering attack on the presumptive Republican nominee, Donald Trump.

Warren was the only holdout among the Senate’s Democratic women and, given her stature among liberals, her endorsement could be an important boost for Clinton.

She also is being floated as a potential vice presidential pick for Clinton.

Meanwhile, Democrats are coalescing around Hillary Clinton’s presidential bid and looking to reunite the party through a carefully orchestrated plan aimed at nudging rival Bernie Sanders aside.

President Barack Obama’s endorsement of Clinton headlined a day of unity for Democrats Thursday as the party prepares for Republican Donald Trump. Amid the message of harmony, Sanders crisscrossed the nation’s capital and received praise in meetings with Obama, Vice President Joe Biden and Senate Democratic leaders.

At his campaign rally outside RFK Stadium, Sanders didn’t mention Clinton and didn’t repeat his calls to persuade superdelegates to support him. Nor did he talk about plans for a contested convention in Philadelphia.

Democrats are wary that divisions that emerged between Clinton and Sanders during the primaries might spill out during next month’s Democratic National Convention.

(TM and © Copyright 2016 CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2016 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)