The ghost of Jack Kevorkian for President's Physician: 2016
We didn't give any warnings or tell anyone how to vote, but after the 2006 elections we terminated several. After the 2008 elections, we terminated a lot more.
Don't know how good of a metric this is but if you Bing "republican vote buying" you get 2,100,000 hits.
If you Bing "democrat vote buying" you get 3,490,000.
Seems that there is plenty on both sides. Doesn't mean that its not something to be diligent about, but it isn't something on which either side can claim any moral high ground (and that is a shame).