If Joe Biden is elected as President — which at this point-in-time seems likely but uncertain — it will be interesting to see if there are changes in the relationship between the President and Congress, particularly with respect to the opposing party. In the past 20 years, we have had three Presidents who have had relatively little history of personal or political relationships inside Congress prior to election as President.
We've had a Governor from Texas from a political family. His prior connections were mostly indirect having never served in Congress.
Then we had a half-term Senator that served for three years before becoming President. He developed some relationships, but served only a relatively short time.
Those two terms were followed by a narcissistic reality-TV-host with a real estate development/branding business. His style has been to mock and belittle anyone who disagrees and threaten members of his own party with primary challenges from his base.
Biden, on the other hand, built long-term relationships and friendships with members of both parties over 36-years in the Senate and 8-years as Vice-President. He was well liked across both aisles due to both his personality and negotiating style. He consciously avoided making political differences personal and focused negotiations on issues and areas of common agreement. As Vice-President, he was assigned an important role with Congress because of his relationships and abilities as a negotiator there.
His deep and decades long friendship with John McCain is well known. But he also formed friendships with many other Republicans, among them are Mitch McConnell and Lindsey Graham. Since Trump's election and the resulting change in tone, rhetoric, and deepened national political divide and becoming a political target as a presidential candidate, the political smoke may have obscured some of those relationships. But beneath the political surface, those relationships may still survive even if weakened by the heat of a campaign.
https://www.post-gazette.com/2016/06/08/Allegheny-College-awards-civility-prize-to-Joe-Biden-and-John-McCainHere is a short 2016 video clip of McConnell discussing the difference between negotiating with Obama and Biden. It's just a little over a minute in length.
https://www.youtube.com/Sen. Mitch McConnell talks negotiating with BidenThis is a longer 2016 video of Mitch McConnell in the Senate discussing his relationship with Biden. It's just a little over seven minutes in length.
https://www.youtube.com/Majority Leader McConnell Pays Tribute to Vice President BidenAnd this what Lindsey Graham had to say about Joe Biden's character in 2015. One-minute and 33-seconds long.
https://www.youtube.com/Lindsey Graham Chokes Up Talking About Joe Biden