Trump's brand in WV may become damaged as China appears ready to back out of a $80 billion dollar deal for natural gas production in the state. If the deal collapses, the voters may well blame the President and his tariffs. Other factors favoring Uncle Joe:
Manchin is native and many perceive Morrissey as an out of state carpet bagger from New Jersey.
Alleged corruption in Governor Justice's now Republican administration.
Morrissey seems to come off as a weak campaigner.
Things can change in five months, but Manchin's seat appears safe for now.