ronald reagan
Ronald Reagan in 1981. Teddy Roosevelt was shot once and survived, but he was out of office by then.
That would be Gerald Ford due to the attempt on President Reagan was well after he took office. Ford had not been in office long after Nixon had resigned.
Technically speaking, they've all been elected in to *office*. However, Ford is the only one who was never elected to the Executive Office (as either President or Vice-President).
Ronald Reagan. He was shot by a homeless man trying to impress an actress that was there. He thought she was pretty and thought she would date him if he looked powerful. Instead, he went to imprisonment. I found this out at the Ronald Reagan Library in California.
All 44 of them
If he has been elected President only once, he usually runs for President.
It was recovered - Guiteau was grabbed by a police officer. It was apparently photographed by the Smithsonian, but it has (apparently) been lost. However, James Garfield (son of the president) did donate the floor tiles that the wounded president fell onto. The Smithsonian has that, as well as a pretty representational drawing of the shooting. The Army Medical Museum has two photographs of Guiteau's skull.
Hamid Karzai, Afghanistan's president, has been in office since 2004.
No, unless there is some technicality I am not aware of
Well 200 years ago Washington was president.
In all unites states history, no president has ever been removed from office by impeachment.