A long-time observer of Washington, D.C. politics has a theory about Democratic nominee Joe Biden: He is just a place holder for bigger, bolder plans for the party.

Rick Manning, who leads Americans for Limited Government, is not the first political observer to predict the ailing Biden, 77, will not be the nominee, but Manning speculates it is virtually certain the party will perform a switcheroo when the time is right.

In the interview on American Family Radio, Manning said Democrats were already concerned about Biden’s mental abilities and then came sexual assault accusations from Tara Reade, a former Biden staffer who claims the then-senator sexually assaulted her in 1993.

Both accusations will end Biden’s candidacy, Manning told show host Sandy Rios, even though it appears prominent Democrats are jumping on board to endorse him -- most recently, the 2016 Democratic presidential candidate, Hillary Clinton.

“And then between June 1 and July 4,” Manning said, “they'll be shocked to discover there are credible charges against Biden and, oh by the way, there's real questions over whether or not he can handle the job and he's just declined. And so, at that point, they'll pick who they want."

Reade versus ‘Believe All Women’

Biden’s odd behavior on the campaign trail, from bullying voters to giving meandering speeches, has drawn both ridicule and pity from political observers. But his continuous actions have gone unnoticed, at least publicly, by many prominent Democrats.

In his latest gaffe, Biden warned about “economic intercourse around the world” if the Trump administration continues its “America First” policy.

The sexual accusations from Reade are more troublesome for Biden, however, since Democrats scorched then-Supreme Court nominee Brett Kavanaugh over allegations he assaulted Christine Blasey Ford when they were teenagers in the 1980s.

Blasey Ford (pictured) was lauded as a feminist hero for testifying about the alleged assault before the U.S. Senate, and female Democrats all but dared male Republican lawmakers to accuse her of lying. That tactic largely worked, even though Ford's vague accusations were considered weak evidence.

“We are here to stand in support of Dr. Christine Blasey Ford,” House Speaker Nancy Pelosi told reporters, “and to applaud her courage as she prepares to tell her story.”

Kavanaugh, meanwhile, was urged by Democrats to withdraw his nomination and told he had to prove his innocence against her allegations.

Nobody wants to be 'holdout'

In the AFR interview, show host Sandy Rios told Manning she, too, had expected Biden to drop out but it appears he will be the nominee, especially with so many prominent names endorsing him.

Manning suggested, however, that fellow Democrats must publicly back Biden now so they can point back to their support for him when the moment comes to toss him aside.

“Nobody wants to be the one who’s holding out,” Manning observed, “because if you’re holding out and not supporting Biden right now, you’re ineligible to be chosen to be the one they pick.”

Manning’s description of Democrats’ sneaky, cynical political strategy drew a laugh from Rios.

“Okay, that makes sense,” she replied.

So who will be the nominee? Manning said Andrew Cuomo, New York’s governor, is the most likely name even after saying he doesn’t want the nomination.