Do Republicans swear at those? Ever since I started working on Democratic campaigns since 2006, every precinct captain or office manager would be dropping F-bombs left and right as long as they weren't on the phones, and at the party on Tuesday when certain results came on the TV, I heard lots of screens like "F**K YEAH!" At the GOTV rally on Monday night one speaker said we need to "Get the f**k out there and win this election." And the video of the Minnesotans United For All Families rally where the spokesperson addresses them right before the moment of victory is announced has him saying "We have f**king called 900 thousand people!" before everyone cheers. You can see the video here (great video no matter what, very powerful).
Considering that Republican campaigns are likely to contain people who are actually offended by that, I wonder how common it is.
No, I've never seen anyone curse at a Republican event. Probably because anyone under 25 would be there in suit and tie trying to look more mature than they actually were. Everyone else would probably be 50 years of age or up.
