I'm pretty sure it means you'd have to bet $185 on Biden to win $100 (plus you get the $185 back) if Joe won.
The bigger the "minus" over 100, the more that outcome is favored by oddsmakers.
For Trump, if you bet $100 on him, you get $160 (plus your $100 back) if the President won.
The bigger the "plus" is over 100, the more of an underdog that outcome is in the eyes of the oddsmakers.
The two sets of numbers NC posted means the race has tightened slightly.
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