If they can paint a picture that it was not a sincere and genuine campaign and was in fact a ploy to pull votes away from the real candidate, sure.

Candidates typically use a distinct version of the name in that case, such as "Daniel" instead of "Dan", or with a distinct middle initial included. A serious candidate does not usually want to be confused with their opponent.

Republicans have purposely run someone (as an independent) with the same name as the Democrat in the past, hoping to peel off dumb voters. Fooling a couple hundred can be all it takes sometimes.