All but one female Democratic senator joined Hillary Clinton to announce their support and raise money for her presidential bid at the Hyatt Regency in Washington, D.C., on Monday. Massachusetts Sen. Elizabeth Warren was the only female Democratic senator who didn't show up to endorse Clinton and has so far refused to back any candidate in the primary. She is also one of six Democratic senators overall who has not announced their support for Clinton. Clinton's campaign declined to comment on Warren's absence and whether she was invited. Each of the senators spoke at the event before Clinton gave a speech on a number of issues including equal pay, paid leave, marriage equality and climate change.