State Representative Marie P. St. Fleur, Attorney General Thomas F. Reilly's choice to be his lieutenant governor running mate, has had three delinquent tax debts in the last four years, including an April 2005 federal tax lien of $12,711 against her and her husband, according to records examined yesterday by the Globe. (snip) Reilly, St. Fleur said, first approached her Saturday about being his running mate and offered her the spot on Sunday. She said she told Reilly that she had ''some financial issues" with taxes and student loans, but that he didn't ask her to provide any numbers and...