Yes but on baseball better to trust Walt Whitman than Thoreau, who could be a bit of a snob.
"Baseball is the hurrah game of the republic!" He was hilarious: "That's beautiful: the hurrah game! well — it's our game: that's the chief fact in connection with it: America's game: has the snap, go fling, of the American atmosphere — belongs as much to our institutions, fits into them as significantly, as our constitutions, laws: is just as important in the sum total of our historic life."
- Conversation with Whitman (4 July 1889) as quoted in With Walt Whitman in Camden (1906) by Horace Traubel, Vol. IV
and
I see great things in baseball. It’s our game – the American game. It will take our people out-of-doors, fill them with oxygen, give them a larger physical stoicism. Tend to relieve us from being a nervous, dyspeptic set. Repair these losses, and be a blessing to us.
Walt Whitman
and...
"In our sun-down perambulations, of late, through the outer parts of Brooklyn, we have observed several parties of youngsters playing "base", a certain game of ball...Let us go forth awhile, and get better air in our lungs. Let us leave our close rooms...the game of ball is glorious."
From the July 23, 1846 edition of the
Brooklyn Daily Eagle, quoted in Florence Bernstein Freedman,
Walt Whitman Looks at the Schools (READ BOOKS, 2007,
ISBN 1406731889), pp. 126-127