Two interviews with him here and here.
He has the endorsement of ImpeachPac and others. Impeachpac:
"While, as a senator, Sheeler will be unable to introduce articles of impeachment, he has spoken out strongly in support of their introduction in the House, he will work to advance investigations in the Senate of the Bush Administration's crimes, and he will advocate for the creation of a special prosecutor.
Sheeler's campaign has placed billboards around the state of Rhode Island with the words "Be Patriotic: Impeach Bush" placed over the text of the U.S. Constitution. Sheeler has raised the issue three times before the Rhode Island General Assembly and has introduced a resolution that would require the state legislature to send impeachment charges to the U.S. House of Representatives. Sheeler has publicly called on his state's delegation to Congress to work for impeachment, and he has supported a coalition in Rhode Island that is working to pass impeachment resolutions in town governments. Sheeler's positions on impeachment are available here