The 47-year-old Gandhi today took as chief of the 132- year-old organisation.
The party workers are determined to make the Congress strong under the leadership of Gandhi, Singh said.
"Gandhi has accepted the challenge to build the party which has a glorious past. Congressmen are determined to walk with him to fulfil his dream," the Leader of Opposition in the state assembly said while congratulating Gandhi.
The Congressmen will fight with full vigour against reactionary forces whose actions have threatened the country's democracy, Singh said.