"It is a victory for democracy," she said after the floor test, outcome of which would be announced by the Supreme Court tomorrow.
It is being seen as a clear setback to the Modi government which had dismissed the state government and imposed President's Rule on March 28.
At the AICC briefing, party spokesman and senior advocate Abhishek Singhvi remarked, "We may have reason to exult."
He, however, hastened to add that it is subject to the final result to be announced by the Supreme Court tomorrow.
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"The political process has worked itself out. If we win, it will prove such political misadventures are akin to a Himalayan blunder," he said, taking a dig at the Modi dispensation.
He steered clear of a question whether after winning the trust vote, Harish Rawat should dissolve the House and order fresh election.
Taking a dig at the Centre, Singhvi said, "Questions will
He maintained that whatever be the decision tomorrow in the apex court, it is clear, "today is a victory for democracy".
Party General Secretary Digvijay Singh wished that the judiciary was "as forthright" on the issue of dismissal of the Congress government in Arunachal Pradesh.
"I wish Judiciary was also as forthright as they were in Uttarakhand in Arunachal Pradesh too," he said.
"Hip Hip Hurray for Democracy and Three Cheers for Harish Rawat. Judiciary has saved our Democracy", he said on micro blogging site Twitter.
"Democracy wins in Uttarakhand. Defeat for conspirators. Truth always wins over muscle & money power. BJP must apologize to the Nation," he said.