AHC: Challenge the sitting POTUS from within the party!

I've seen a few what ifs floating around and it got me thinking. So here is the task. Have a member of the sitting POTUS's own party, challenge him for the nomination.

-You can use any election year you like. (After 1900 of course)

-Sitting POTUS must have run for re-election as per OTL

-Give us your challenger, and why they might have challenged.
 
I've seen a few what ifs floating around and it got me thinking. So here is the task. Have a member of the sitting POTUS's own party, challenge him for the nomination.

-You can use any election year you like. (After 1900 of course)

-Sitting POTUS must have run for re-election as per OTL

-Give us your challenger, and why they might have challenged.

Eugene McCarthy, Ronald Reagan and Ted Kennedy say hello from OTL.
 

nbcman

Donor
Lyndon LaRouche of OTL if you accept a fringe candidate masquerading as a Democrat in 1980 and 1996.
 
For the sake of it, George Wallace ran in 1964 against Johnson but would've done the same had it been against Kennedy.
 
Bernie Sanders primaries Obama in 2012. He said it would be a good idea...

(I'll avoid mentioning my own flamebaity reason why he didn't do it himself. :) )
 
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