By Sima Kotecha
Newbeat US reporter
Hillary Clinton has pledged to "fight like Rocky" as she continues to go to head to head with fellow Democrat Barack Obama.
Hillary Clinton reckons her and Rocky Balboa have a lot in common
The Presidential hopeful reckons her and Rocky Balboa have a lot in common.
Of course, it's not the dark hair, or the deep voice that gasps "Adrian" everytime Rocky scores a knockout. She's talking more about the fighting spirit.
This week, Hilllary Clinton told America she's in the presidential race until the end, even though, she's currently got fewer delegates than her rival, Barack Obama.
"Let me tell you something. When it comes to finishing the fight, Rocky and I have a lot in common. I never quit," she said.
So the Rocky analogy is something Clinton's grabbed to show her perserverance in the contest.
But Barack Obama's had other stuff on his mind. He's still got his gloves on and the democratic contenders continue to entertain the media by throwing jabs at each other.
It's just been calmer this week as he's been focusing on getting endorsements from others in his party.
Those that have announced their support for Obama this week include Lee Hamilton, who was the vice chairman of the 11 September commission and Henry Nicolas who is the president of the National Union of Hospital and Health Care Employees.
Strong and confident
But the Senior Democrat who has made the headlines for not saying who she's backing is the house speaker, Nancy Pelosi.
She is a lot like Hillary Clinton - strong, bold, and confident.
In an interview with ABC, she said it was important to get behind one candidate if the party expected to win the White House in November. But she's didn't say which candidate she preferred.
A number of Obama supporters have been calling for Hillary Clinton to concede the race.
So if Hilary is Rocky, then maybe Nancy Pelosi is the ref, standing in the middle of the two, calling for a fair fight and giving them equal support.
But sooner or later she has made it clear she wants to see a knockout from either one of them.
So the candidate that's not left on the canvas can be crowned Democrat heavyweight ahead of the ultimate encounter - the fight for the White House against republican John McCain in November.