Biography

# David Costello David Costello is a Democratic candidate for U.S. Senate from Maine. [Additional factual information about his political career, current office, prior roles, and relevant background would be included here based on verified biographical data.] --- *Note: I don't have access to the specific Wikipedia or Ballotpedia content you referenced, so I've provided the format. To complete this properly, please share the actual biographical details from those sources, and I'll craft 2-3 sentences following your requirements.*