Former Altanta Mayor Manyard Jackson has quietly began speaking to influential Democrats in Washington and elsewhere to measure whether to mount a challenge to current DNC chairman Terry McAuliffe when the DNC's executive board meets in February.The New York Times reported last week that Jackson who squared off against McAuliffe for control of the DNC in 2001, has sent a letter to McAuliffe demanding a meeting of the DNC board where McAuliffe could explain the Democrats recent defeat.Jackson had challanged McAuliffe a year ago on the grounds that the Clinton money man was too focused on money, not on building...