The former chairman of New York’s Liberal Party was charged on Wednesday with accepting more than $800,000 that prosecutors say was a reward for doing political favors for the former state comptroller Alan G. Hevesi. The former chairman, Raymond B. Harding, 74, was also accused of helping to clear an Assembly seat in a Queens district so that Mr. Hevesi’s son, Andrew, could run for it in 2005. Attorney General Andrew M. Cuomo said that Mr. Harding, once a close political ally of former Mayor Rudolph W. Giuliani and a power broker in state politics, provided “30 years’ worth” of...