“I tell you it’s like déjà vu, seeing the same old cast of characters doing the same old dirty tricks from the Democratic playbook,” Brown said to a packed restaurant in Quincy, Mass., according to The Boston Globe.

It was Brown's first and only appearance on the campaign trail for Gomez, and came the same day a final poll of the race showed him lagging Democrat Edward MarkeyEdward (Ed) John MarkeyOPEC and Russia may raise oil output under pressure from Trump Tech companies scramble as sweeping data rules take effect Fixing a colossal mistake in the tax bill MORE by 10 percentage points.

Though Gomez's campaign still insists it is optimistic heading into Election Day, the atmosphere in the race is significantly different from the enthusiastic wave of Tea Party support that brought Brown to the Senate in 2010.

Then, the Republican saw a final surge in the polls and in fundraising in the last few days of the race. Now, polls have consistently given Markey a lead, though the margin has fluctuated, and turnout is expected to be at a record-low for a Senate race in Massachusetts.

Brown was dismissive of the polls, however, again drawing a comparison between the current race and his own.

"They are trying to suppress the numbers, obviously," he said, according to the Springfield Republican. "It's over. He is up 10, 20, 100, whatever. It's the same stuff they did before."

Though Gomez has tapped the former senator for fundraising and strategic advice, until now, he remained out of the race. He's spent time over the past two months traveling instead to New Hampshire for a smattering of appearances at local GOP events. Brown is rumored to be considering a senate bid there.

Asked why he hadn't stepped into the senate race in Massachusetts earlier, Brown said he hadn't been asked.

“Publicly this is the first time I’ve been asked to endorse him," Brown said, according to WGBH. "I’m here to help and I’m glad we’ve been able to help.”