The Governors Wife (2008)

Heather McManus and her boyfriend, Judd Shaw go to live with his Ann in her mansion after Ann’s second husband is shot. Heather learns that her potential mother-in-law isn’t only rich and powerful, she’s also mentally ill and will stop at nothing to see her plans for her son carried out. She’s determined to have Judd become Governor, even though he’s told her he’s not interested and she’s willing to resort to murder to make it happen.