Did The Obama Administration Kill Andrew Breitbart??

Conservative blogger Andrew Breitbart, the man behind the ACORN sting, claimed to have video of President Obama in his young radical college days. Breitbart revealed this during his CPAC speech and said he would release them during Obama’s re-election campaign. Is this why Breitbart died at 43 years old of NATURAL CAUSES? Did the Obama Administration kill Andrew Breitbart?