The shootings and the campaign

[Verily]

Unless a gun control debate erupts over it (which hasn't happened yet, so it probably won't) this isn't the sort of thing that affects a presidential race.

It did affect 2000, though. Gore's pro-gun control stance helped him immensely in the suburbs, and that was mostly a result of Columbine.

[Verily]

Was Columbine the first of these shootings in USA? I mean a teenager with big guns who choose a place to shoot a maximum of peoples in it.

Do these shootings become "normal" in USA...?!?

Columbine was the worst, and still is. School shootings have risen since then, but I think a lot of the rise actually has come as a result of Columbine. Most of the current perpetrators are Columbine copy-cats who have decided it's a great way to go out with a bang. (These days, anyway, students may be too young to remember Columbine, but they have other copy-cats to copy.)

[Verily]

Was Columbine the first of these shootings in USA? I mean a teenager with big guns who choose a place to shoot a maximum of peoples in it.

Do these shootings become "normal" in USA...?!?

Columbine was the worst, and still is.

No, that actually isn't true.  More people died in the Virginia Tech shootings than in the Columbine shootings.

I was thinking about high schools specifically, but, yes, Virginia Tech was worse.

(Although the Bath School disaster, which didn't involve guns, trumped both.)