Only if the fraud is in favor of the Democrats. It can only be investigated if it's Republicans commiting the fraud.
This is why it's always been okay with me if we have the United Nations or Yugo Chavez or Iran "monitor" our elections.
Especially in Republican-held bastions such as Chicago, Detroit, Cleveland, Buffalo, Boston, New York City, Philadelphia, St. Louis, Kansas City, Memphis, New Orleans, Seattle, Lost Angeles, San Francisco, Denver, Miami, Milwaukee, &c., &c., &c., and in Republican blocs such as the black vote.
There's no way in Hell in our society that a candidate gets 90+% of the popular vote, or that there's more votes than the entire voting age population of an area.