The Democratic candidate for Maryland's First Congressional District has withdrawn from the race after the state party said she committed voter fraud.

Wendy Rosen, who was set to face Republican Rep. Andy Harris in November, announced her resignation via e-mail to Democratic officials.

"I have been proud to serve as the Democratic Congressional Candidate of Maryland's 1st Congressional District for the last five months, so it is with great regret, and much sorrow that I must resign," she said. "Personal issues have made this the hardest decision that I have had to make."

In a letter to Maryland Attorney General Doug Gansler, Yvette Lewis, chairwoman of the Maryland Democratic Party, asked for a "full investigation" of 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," Lewis wrote.

Lewis later added, "There should be zero tolerance for voter fraud of any kind. The Maryland Democratic Party has asked Ms. Rosen to withdraw her candidacy for the U.S. House of Representatives."

Most analysts expected Harris to trounce Rosen, as the Eastern Shore district has become even more conservative in the wake of recent redistricting.