that's insane.

I remember WaPo doing an article about it like 30 years ago. The song, which is sung to O Tannenbaum (or -- as we know it -- O Christmas Tree), is pretty much pro-Confederacy. I doubt anything substantial will be done to change the song because:

1) Hogan is Governor
2) It's only ever heard during the Preakness, and they don't sing that part of the song
3) There are a lot of Marylanders that geek out over preservationism that will argue it's just as much a part of the state's history as Antietam and stops on the Underground Railroad.
4) Unlike New York, there just aren't a lot of songs about Maryland that lend themselves to being a replacement/additional anthem (NY has like 4 state songs)

MARYLAND, MY MARYLAND
By JOHN T. WHITE

(To the tune: "O Tannenbaum" )

We dedicate our song to thee,
Maryland, my Maryland.
The home of light and liberty,
Maryland, my Maryland.
We love thy streams and wooded hills,
Thy mountains with their gushing ril
Thy scenes our hearts with rapture thrills,
Maryland, my Maryland.

In twain the Chesapeake divides,
Maryland, my Maryland.
While oceanward its water glides,
Maryland, my Maryland.
Yet we in thought and purpose one,
Pursue the works so well begun,
And may our State be ne'er outdone,
Maryland, my Maryland.

Proud sons and daughters boast of thee,
Maryland, my Maryland.
Thine is a precious history,
Maryland, my Maryland.
Brave hearts have held thy honor dear.
And met the foeman far and near,
But victory has furnished cheer,
Maryland, my Maryland.

Sail on, sail on thou Ship of State,
Maryland, my Maryland.
May we thy children make thee great,
Maryland, my Maryland.
May gratitude our heart possess,
And boldly we thy claims express,
And bow in loving thankfulness,
Maryland, my Maryland.

However -- like I said -- Hogan & preservationist geeks.

As indicated in the article, it's a long-known problem.

"She is not blind, nor deaf, nor dumb
Huzzah! We spurn the northern scum!"

It was essentially written as a Confederate battle anthem and used as such by the Confederate armies as a gesture of solidarity with Maryland which stayed with the Union even though it was a slave state. There is not much question that there were a lot of Confederate sympathizers in Maryland but whether Maryland would have joined the Confederacy without the Federal presence is hard to say. Virginia was late in joining and a big chunk of Virginia stayed with the Union as West Virginia. It is likely that something similar would have happened in Maryland if Maryland had joined the rest of the South. In any event, the offensive lyrics of the song do not have a whole lot of claim as "heritage" of Maryland - the words are almost never sung, the song is pretty much used only as an instrumental. I have lived in Maryland since 1979 and I have never heard the words sung. I doubt that many Marylanders would expend a lot of energy defending the words. I suspect that a bill to adopt new lyrics would sail through the legislature and be signed by Hogan. After all, the song is extremely disrespectful to Lincoln, one of the founders of the Republican Party and its first President.

Sail through the legislature - most likely

Signed by Hogan? I'm not as sure as you are about that.

No longer locally acceptable. There is an active Sons of Confederate Veterans group locally, however they are wildly outnumbered.