Removing the doubts and concerns of the Senate Democrats, Joe Biden reassured them he would make a vigorous effort during the campaign's final stretch. The former vice president vowed an aggressive campaign schedule, campaigning through crucial swing states, and helping key Senate races in the process, Democratic senators said on a conference call on Sept. 17.

Speaking for about 25 minutes, and taking some questions, Biden said he was not taking the polls showing him ahead of Donald Trump seriously. Currently occupying Biden's old Senate seat, Sen. Chris Coons of Delaware said Biden said he was optimistic about the election, but at least three times said that he takes nothing for granted.

Referencing the polls that show Trump lagging, the former veep said he is working tirelessly and was in Florida and will be heading to other key battlegrounds soon. Coons said Biden restated the campaign's core themes, "fighting for the soul of the country."

Rhode Island Democrat, Sen. Jack Reed suggests Biden will be traveling more. He said the message was how the campaign is gearing up to win and taking nothing for granted. Delaware's Sen. Tom Carper Biden's message implied that the race was not over yet, but he expressed gratitude towards his Senate colleagues for supporting him, CNN reported.

Biden explained that everyone needs to run through the tape to Election Day, according to Carper. Virginia's Sen. Tim Kaine talked about Biden's attention to the Senate races as well, in the battle for control of the chamber.

Democrats must get a net gain of three seats in a bid to win a majority if they also win the White House since the vice president breaks ties in the Senate. If they end up losing the presidency, Democrats would need a net gain of four seats.

After the call, the 2016 Democratic vice presidential nominee, Kaine said he thinks Biden will be very vigorous in the campaign's concluding stretch. A Michigan Democrat, Sen. Gary Peters noted that Biden had an incredible amount of energy on the call.

Peters, who is one of the two Democrats running for re-election in Trump states this year, said Biden would help his race in Michigan without an iota of doubt. Sen. Dick Blumenthal said the Democrats did not raise concerns regarding the state of the campaign, with Biden speaking generally about the state of the campaign and explaining why he is so hopeful.

Aside from that, Biden spoke about how they were using surrogates to contrast basic values, substance, and style, the Connecticut Democrat added. West Virginia's Sen. Joe Manchin said the former vice president's schedule is packed for the final weeks.

Moreover, Manchin said that the nominee assured that the money is pouring into the race. "If you don't like Joe, you don't like yourself," he said.