Either way I think the Barack Obama Health Care Reform Act's (BOHCRA) passage is assured - possibly with a Medicare buy-in or maybe even that damn Public Option the Left was incessantly whining about. (Lieberman shamed into doing the right thing)
Other effects really depend on what kind of person the assassin is, don't it?
A paranoid schizophrenic black woman almost murdered Martin Luther King Jr. in 1958 at a book signing with a letter opener!
(if that sounds like a interesting PoD to you, i'm trying to think up a nice dystopian timeline for that lol)
So let's suppose some apolitical non-white crazy person managed to shank him somehow at a rally somewhere.
I really think it would be relatively quiet - no riots, no damage to the GOP, maybe a mental health reform bill and probably no more handshake lines for sitting Presidents so far as Secret Service can help it.
If its a gun, firearm sales explode like never before after a national gun tragedy....but the fear would probably be warranted this time, because gun control would have one hell of a mandate. Imagine if it was someone who exploited the gun show loophole, yikes. JFK brought us the Gun Control Act of 1968 in OTL.
Now if this assassin's motives are political, then God Help that TL. Even if there's no riots or violence its just terrible for a democracy.
whats the worst case scenario that could happen for republicans?
A Tea Party birther who absorbed all the Obama hate in the Fox News/Talk Radio/Free Republic echo chamber and decided to stop the "Communist Usurper". The American Right could find its wings clipped substantially. Many Republicans who would otherwise continue to despise Obama IOTL would be looking at horrifying viral videos, watching news footage of his kids sobbing at the (
MASSIVE) funeral, and wondering what happened to The Party of Lincoln. (moreso if the wife was there ala JFK....or
God forbid, the whole family ala
Malcolm X )
Any elected Republican anywhere, who previously said something nasty enough about Obama that it could be construed as contributing to the toxic environment that led to his death ITTL, will be in deep trouble. The Tea Party would live in interesting times.
Progressive wave in 2010, Biden saves the world with Cap n Trade, tougher Dodd-Frank, infrastructure building, prison reform, marijuana reschedulization- okay i'll stop lol.