If asked, Vice President Joe BidenJoseph (Joe) Robinette BidenBiden says 'enough is enough' after Santa Fe school shooting Zinke provided restricted site tours to friends: report Democrat wins Philadelphia-area state House seat for the first time in decades MORE said in a recent interview he would raise money for Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellTrump's plan to claw back spending hits wall in Congress GOP lawmakers want Trump to stop bashing Congress Parkland father calls out Trump, McConnell, Ryan after Santa Fe shooting MORE’s (R-Ky.) likely general election opponent. 

However, Biden said he has never campaigned against a sitting Republican — not to mention, a leader of the party — and admitted it is a bad idea. He made the distinction between raising money for Democrat Alison Lundergan Grimes in Kentucky and campaigning against McConnell. 

“I think it’s a bad idea, and it’s happened too much but I’ve never done it — for sitting Senators of either party, and leaders of either party, to campaign personally against the other leader,” he said in a Time magazine interview published Monday. “But I will be campaigning for a lot of Democratic races where there is an incumbent Republican.”

But Biden said he would likely get involved in as many as 150 races, including ones that have a sitting Republican incumbent. 

Biden has a personal relationship with Lundergan Grimes’s father, Jerry Lundergan. Her father was chairman of Biden’s 2008 presidential campaign in Kentucky. 

“So, will I go into Kentucky? Jerry Lundergan, who is the dad of our candidate, is a close friend of mine,” he said. “He was the Biden chairman for my effort to win Kentucky, which we never got to in ’08, so I’m sure I will help his daughter if they ask to raise money.”

Lundergan Grimes, Kentucky’s secretary of State, is locked in a tough contest with McConnell, who also faces a primary opponent. In a recent poll, she topped McConnell by 4-percent as his approval level in the state has dropped. 

Bill Clinton, another personal friend of Lundergan Grimes’s father, is slated to a campaign with the Democratic candidate Feb. 25