Huh? You need a majority of the electoral college or else it goes to the House, which votes by state delegation (majority of states needed) among the top 3 candidates. If no electoral college majority for VP the Senate chooses the VP from the top two.
In a two way race, you need 270 electoral votes to prevail. The final tally could be 270 to 268.
270
268
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538
In a three way race, you need 181 electoral votes to prevail.
It could look something like this.
181 Perot
180 Bush
177 Clinton
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538