Get ready for the thundering herd . . . of candidates

Lawrence O’Donnell, a noted MSNBC commentator, believes the upcoming campaign for the 2020 Democratic Party presidential nomination is going to be a very crowded affair.

He believes the number of candidates will “start with the number two,” meaning that he expects more than 20 politicians to seek the nomination in hopes of running against Donald J. Trump.

On almost any level, this is an astounding story if it develops as O’Donnell believes it will. We might have an incumbent seeking re-election. Incumbency is supposed to build in a lot of advantages: platform, visibility, name ID, the perks of power.

Incumbent presidents often seek re-election miles ahead of any challenger.

Not this time. Not this president.

In 2016, we had 17 Republicans declare for their party’s nomination at the start of the primary season. Trump knocked them one by one over the course of the GOP primary campaign. He won the nomination on the first ballot and then, well, the rest is history. Meanwhile, Democrats fielded four candidates at the start of their season. Hillary Rodham Clinton emerged as the nominee. Again, you know it turned out for her.

That number seemed high at the time, although we had no incumbent running in 2016. President Obama had to bow out, according to the 22nd Amendment to the U.S. Constitution.

The expected massive field of Democrats well might not even be the biggest story of the 2020 campaign. I am wondering — although not predicting — whether the president is going to receive a primary challenge from, oh, as many as two or three Republicans. Sen. Bob Corker of Tennessee might be in the mix. Same for Ohio Gov. John Kasich — my favorite Republican from the 2016 campaign. Then there might be Sen. Jeff Flake of Arizona.

History shows that incumbents who receive primary challenges often do not fare well when the smoke clears and they have to run against the other party’s nominee in the fall. Just consider what happened to President Gerald Ford, President Jimmy Carter and President George H.W. Bush when they ran and lost in 1976, 1980 and 1992 respectively.

So, the new year begins with two Democrats already getting set to launch their campaigns. Sen. Elizabeth Warren and former San Antonio Mayor Julian Castro are planning to form exploratory committees as precursors to their candidacies. There will be many more to come.

Oh, and then we have the Robert Mueller investigation and whether his final report might inflict more political damage to an already wounded incumbent.

I am so looking forward to this new year.