In 2012 Maryland Democrat Party found one of its candidates was guilty of vote fraud at least twice and asked her to drop out which she did-Washington Post

.
Candidate voted in both Maryland and Florida in 2006 and 2008:

9/10/2012, "Maryland Democrat quits congressional race amid vote fraud allegations," Washington Post, Ben Pershing

"A Maryland Democratic candidate quit her congressional race Monday after her own party told state officials that she had committed fraud by voting in both Maryland and Florida in recent elections.

Wendy Rosen, a small-business owner running against freshman Rep. Andy Harris (R) in the Eastern Shore-based 1st Congressional District, released a statement saying that “with great regret, and much sorrow” she was resigning from the contest.

“Personal issues have made this the hardest decision that I have had to make,” Rosen said. Rosen’s announcement came the same day the state Democratic party released a letter to state Attorney General Douglas Gansler and state prosecutors reporting the allegations against Rosen.

“The Maryland Democratic Party has discovered that Ms. Rosen has been registered to vote in both Florida and Maryland since at least 2006; 

that she in fact voted in the 2006 general election both in Florida and Maryland; and  
that she voted in the presidential preference primaries held in both Florida and Maryland in 2008,”

wrote Yvette Lewis, the state party chair. “This information is based on an examination of the voter files from both states. We believe that this is a clear violation of Maryland law and urge the appropriate office to conduct a full investigation.”

A senior Maryland Democrat said the party had been tipped off this weekend by someone within the party about Rosen’s potential issue. After checking the allegation, the party contacted Rosen on Monday morning and urged her to quit.

Local Democratic committees in the 1st district will now meet and vote on a new candidate to replace Rosen on the ballot. The new name must be submitted to the state by Sept. 27....

As recently as Sunday, Rosen still believed her campaign was going full-speed ahead.

“My trip to Charlotte was incredible!” she wrote on her Facebook page. “I didn’t get a moment on the floor of the arena ... I spent all of my time hunting for campaign support! Everyone was so helpful from Jan Schakowsky and Ben Cardin to all of the women’s groups, environmental groups, jewish organizations. I feel re-energized for this last 8 weeks! Forward, not Backward!”"


==================================