Originally Posted by doublejm1
Hm, I didn't know this. Why did Teddy dislike Jefferson?
There's a book:
that has a chapter on Jefferson, "I Distrust Him and His Influence" p.75
I bought a copy purely so I can read, and have on hand, the chapter.
It isn't because I think the book is good, it is barely worth more than the glue
holding it together.
Teddy is making a fatal historical mistake from one who bragged about
being a historian, "I claim to be a historian, and I speak simply in the
spirit of one." 
Teddy had the comfortable 100 year view of Jefferson and didn't like
a lot of Jefferson's actions while president. Teddy lived in a totally
different world and was unwise to toss stones like from a slingshot at
Teddy liked men who were more non-stop, act and think later, men
who bullied others into getting what he wanted. Seems like he was
over compensating for being so sickly (and rich)
Seems to me Teddy was more jealous of someone he personally
didn't like, getting high praise for being more an intellectual than
a hyperactive man-child.
Teddy should have opened his closed eyes and looked at what
Jefferson and he had in common: a love of history, a love of
reading, the environment, the outdoors and the love for the same
For all Teddy's showmanship-attention-getting jaunts, and physical
activity, he was the one who would die young compared to Jefferson.
I can speculate that on his death bed, Teddy was thinking, "I'm dying and that rascal Jefferson lived longer than me."
 Daniel Ruddy, Theodore Roosevelt's History of the United States: His Own Words, Selected and Arranged by Daniel Ruddy
, (New York: Smithsonian Books, 2010),11.