As for the Pending Democratic Senate Primary

I offer my heartiest endorsement to Senator Ed Markey, for renomination and reelection. In a sea of Massachusetts' Politicians who all burn with the Fever Dream of Avenging 11/22/1963 and proudly Marching to the Banks of the Potomac...Markey is an anomaly, a progressive workhorse.  We've got Men of Destiny, Women of Destiny, Eloquent Seraphs, Prophets, Sorceresses...But only Ed Markey seems to realize that an Expansive Free and Democratic Vision of the Future, requires a lot of hard work and sacrifice.
Change comes of the unnatural marriage of zeal and perseverance, those are both "Brand Markey" to the core.
Kennedy is a good man, I guess...He hasn't really wrung up a very long record in congress, he is definitely the vanguard of the Commonwealth's deathless "March to the Potomac" brigade, other than that, I hardly know the man, his commercials make him look awfully young like he should be assistant managing a Dairy Queen or Something.
But I digress, it was different with Kennedy's Father, I'd a walked thru fire for that guy, The Spartan's of Arlington loved him.  But times change, but the change agent here, is Markey not Kennedy, he's put the time in, if the democrats carry both Houses of Congress this Fall, Markey will at last be in a position to put paid to his Agenda.
I wanna see that happen, I don't wanna start over with some new guy, especially some new guy who'll  be raising funds to run for President by Thanksgiving should he be nominated.
Lets keep our Heads Here, and Lets Keep Ed Markey.

On the other hand,

I wouldn't mind one bit if every statue and memorial in the USA erected to the deathless memory of the likes of Robert E. Lee or Jefferson Davis were melted down to make durable commodes in public housing projects.  Those men reneged on a solemn oath taken to defend the US Constitution that they subsequently defied and sought to destroy.
That having been said, the removal of such lascivious and unpleasant memorials is more on the "symbolic politics" spectrum, it's nice but it doesn't change anything.
So If, your goal is, a demilitarized police force, drawn from a diverse citizenry & trained to function honorably in a democratic society, then I don't think dropping Christopher Columbus' statue into the Harbor gets you there.
Just saying, the politics of distraction have an honored history in the USA they are designed to thwart progress either by slowing down the critical time frame or else dissipating the unity of progressive forces.
As I said, just sayin'.

President Andrew Johnson isn't remembered well these days...

and there are legit reasons for that, let us be honest. The man was a "piece of work" on racial issues to be sure. But let us also recall that when his home state of Tennessee seceded from the Union in 1861, Johnson loudly denounced all secession & rebellion, he chose His Country over His State.  He was the only southern US Senator to choose the Federal Union over the Confederacy, the only one.
Robert E. Lee, faced with the exact same choice, bound by oath to the US Constitution, begged by Abe Lincoln to command his armies and put down the rebellion, made the opposite decision.
Robert E. Lee chose "State before Country", and yet somehow today we are finally getting to debating what is to be done with all these statues of the Commander of the Army of Northern Virginia.  Frankly if all those statues of Marse Robert were melted down to make bronze commodes in Public Housing Projects, no one would be happier than I.  Remember that when the debate starts about the statue of Andrew Johnson in the State Capitol in Nashville Tennessee, as bad and misguided as Johnson was, he choice the Union and the US Constitution, that matters.