If asked, Vice President Joe BidenJoseph (Joe) Robinette BidenBiden: Trump ‘dumbs down’ American values Breitbart editor: Biden's son inked deal with Chinese government days after vice president’s trip Biden makes endorsements in top House races MORE said in a recent interview he would raise money for Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellSenate tees up Yemen vote for Tuesday Senate confirms Trump's border chief House leaves out ObamaCare fix from must-pass funding bill 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