I'm no expert in this, but Bouie is talking about something that underlies the discussion several of us were having with Callatoroy yesterday. I am positive that if you polled Republicans, or even just MAGA, huge percentages would say they agree with the Declaration of Independence and Lincoln that America is, or should be, "dedicated to the proposition that all men are created equal." But the rot at the core of MAGA, and hence the Republican Party, is driven by two realities.
First, a shocking number of MAGAs do NOT believe that the proposition that all men are created equal is essential to our national identity. The current executive branch is stocked full of those MAGAs, and a huge percentage of Republicans in Congress, including Schmitt, fall into that camp as well. This is not to absolve the rank and file Republicans, because they're directly responsible for those people being in positions of immense power. But the reality is that regardless of what Republicans say they believe, the Republican leadership in Congress, and in many states as well, is absolutely NOT dedicated to the proposition that all men are created equal, and like Schmitt, they're increasingly willing to say that out loud.
Second, even the rank and file Republicans who say they believe in that proposition endorse policies that are inconsistent with it. What they appear to actually believe is that all native-born Americans are created equal, or maybe that all current American citizens are created equal, or maybe that all straight native-born Americans of European descent who have not committed a crime, do not have a mental illness, and who (legally) own guns are created equal. However they think about it, they clearly do not believe in Lincoln's proposition, because if they did, they would not support what Trump is doing in the areas of immigration, foreign policy, foreign aid, LGBTQ rights, etc., etc., etc.
If you truly believe that all people are created equal, I do not see how you can continue to vote for Republicans in this day and time. You CERTAINLY can't vote for MAGA. While some Republicans may say they disagree with what Schmitt said, by voting for Republicans, they're voting to subject all of their fellow, supposedly "equal", Americans and would-be Americans to policies that are utterly inconsistent with Lincoln and the Declaration of Independence.