If nothing else, Mooch makes Hillary seem like she s not such a bad candidate after all .If Michelle Obama decided to run for president in 2016 she would represent the most significant threat, among likely contenders, to Hillary Clinton s chances of winning the Democratic nomination, according to a new Rasmussen poll.A telephone survey of 1,000 likely voters conducted by the polling company found that, in a hypothetical match-up between the current First Lady and the former secretary of State, Clinton would best Obama 56 percent to 22 percent.That may seem like a significant margin, but according to the most recent RealClearPolitics polling average, Elizabeth Warren   Clinton s other biggest hypothetical challenger   nets just 12.5 percent to Clinton s 64 percent.Sen. Bernie Sanders (I-Vt.), the only other declared Democratic candidate for President, is even further behind with 7.4 percent. Former Maryland Gov. Martin O Malley, who is expected to announce his bid on May 30, fares the worst against Clinton with 1.2 percent of support from likely voters.The first lady is highly unlikely to mount a presidential campaign, however. In fact, of the people surveyed by Rasmussen, just 14 percent thought she should run.Still, 40 percent of black voters welcomed the idea of her running, and she bests Clinton among those voters, with 44 percent support among African-Americans compared with 36 percent for Clinton.Obama herself recently joked about a possible October surprise, hinting to  Late Show  host David Letterman that the thought had crossed her mind.Via: The Hill