Incumbents usually win especially with a good economy.
http://www.cbc.ca/news/business/u-s-manufacturing-slump-knocks-stock-market-lower-1.5304970
.... and recession is looming with unresolved trade battles going on everywhere.
We don't even have a North American trade treaty. The only ones that have ratified Trump's deal are the Mexicans and it looks like the whole thing has sputtered out for good.
Get rid of Trump and get everybody back to trading.