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“And that means those legions of African Americans and Latinos are not automatically going to come out. No one has energized them like Barack ObamaBarack ObamaCongress needs to assert the war power against a dangerous president CNN's Don Lemon: Anyone supporting Trump ‘complicit' in racism DOJ warrant of Trump resistance site triggers alarm MORE. But he’s not on the ticket. So don’t take this one for granted,” he added.

Biden spoke to Markey supporters at a Washington, D.C., fundraiser hosted by former Vice President Gore and Vicki Kennedy, widow of former Sen. Ted Kennedy (D-Mass.) that brought in about $250,000, according to Markey's campaign.

The congressman himself did not attend the fundraiser, spending his night instead sparring with Republican Gabriel Gomez in their second debate.

Biden praisEd MarkeyEd MarkeySenate Dem: Trump has to stop ‘reckless’ language on North Korea Trump sparks debate over war resolution for North Korea Foreign Relations Dem: North Korea is the modern-day Cuban missile crisis MORE effusively and said he could have a "potentially profound impact on the issues of the day" if elected to the Senate. Biden said "a single vote" could be pivotal in raising the debt ceiling and passing immigration reform.

“I’ve been doing this a long time. I’ve seen a lot of people come and go,” Biden said. “But few have the quality of character, and intellect, and emotional IQ that Ed Markey has."

He continued to warn, however, that supporters shouldn't "underestimate this race," noting that the timeframe of the special election meant many voters were likely tuned out.

“I know I’m preaching to the choir,” Biden said after praising Markey. “But I’ve gotta tell ya. Don’t underestimate this race. Ed’s ahead, Ed should win. But this is a strange moment. There’s not a lot of people paying attention.”

And though Biden didn't mention Markey's opponent by name, he criticized the GOP, saying the nation didn’t need another Republican Senator in Washington.

Biden said there is a "chasm" between the two parties.

“I’m being straight about this," he said. "This is not your father’s Republican Party. It really is a fundamentally different party. There’s never been as much distance, at least since I’ve been alive, distance between where the mainstream of the Republican congressional party is and the Democratic Party is. It’s a chasm. It’s a gigantic chasm.”

Biden suggested Republicans in the Senate were beholden to Sens. Ted CruzTed CruzThe media couldn't be more blatant in distorting Trump's words on Charlottesville Curtis wins GOP primary for House seat vacated by Jason Chaffetz Kimmel: Let’s make Trump a king so he has no power MORE (R-Texas) and Rand PaulRand PaulCurtis wins GOP primary for House seat vacated by Jason Chaffetz Glimmer of hope in bipartisan criminal justice reform effort Trump barrage stuns McConnell and his allies MORE (R-Ky.) on gun control, saying that he called 17 senators out on their votes against gun-control legislation and all said they were concerned the two senators would campaign against them.

“Not one of them offered an explanation on the merits of why they couldn’t vote for the background check. But almost to a person, they said, ‘I don’t want to take on Ted Cruz. I don’t want to take on Rand Paul. They’ll be in my district,' " he said.

Markey has led Gomez throughout the race but many polls show him up by only single digits, stoking Democratic worries that the party could suffer an upset similar to the one that brought former Sen. Scott Brown (R) to the Senate in 2010.

To prevent such an outcome, Democrats have rolled out some of their biggest names to campaign for Markey, including first lady Michelle ObamaMichelle ObamaKim Kardashian says she and Kanye once sang karaoke with Obama Obama talked trash, won money from 3 celebs over golf game Former Michelle Obama aide enters Maryland governor's race MORE, Biden and on Wednesday, Obama, who will stump for him in Massachusetts.