Fannie Mae announced it has replaced the company’s outgoing top finance executive from within. David Benson, 53, currently Fannie’s executive vice president of capital markets, securitization and corporate strategy, will be the GSE’s fourth chief financial officer since the company’s government takeover in September 2008. Benson replaces Susan McFarland, who joined the company as CFO in July 2011. She will step down as soon as Benson assumes the position and will remain employed by Fannie as a senior advisor for a transition period through June 30, 2013, according to a Securities and Exchange Commission filing.