https://www.trafalgarstrategy.com/news/wv-senate-poll-july-18/TFG conducted this survey of 1158 respondents from a random stratified selection of likely 2018 general election voters. The margin of error is +/- 2.88. The results were:
49.9% Joe Manchin (D)
39.5% Patrick Morrisey (R)
2.3% Rusty Hollen (L)
8.3% Undecided
They also did some weird push poll thing with the Kavanaugh nomination. Not gonna post the numbers, but basically showing that Manchin is more likely to be reelected if he votes to confirm.
